For more information, see Row States and Row Versions. FileLoadException is thrown if assemblyString specifies the full assembly name, and the first assembly that matches the simple name has a different version, culture, or public key token. The DataSet isn't responsible for tracking changes in order to allow synchronization with the secondary data source. The file specified in filename was not found. These scenarios describe standard usage for a DataTable, describing its update and merge behavior. The specified path, file name, or both exceed the system-defined maximum length. An assembly or module was loaded twice with two different evidences. The following table describes the three load options provided by the LoadOption enumeration. For more information about the use of evidence with overloads of the Load method that take byte arrays, see the Load(Byte[], Byte[], Evidence) method overload. Azure Load Testing Preview is a fully managed load-testing service that enables you to generate high-scale load. In terms of event operations, the RowChanging event occurs before each row is changed, and the RowChanged event occurs after each row has been changed. WebThe Load method provides a technique for filling a single DataTable with data, retrieved from an IDataReader instance. A DataSet synchronizes or updates with a single primary data source. C# public virtual void Load (string filename); Parameters filename String URL for the file containing the XML document to load. In this The first is taken from a Windows Forms data binding application where Load is used to The URL can be either a local file or an HTTP URL (a Web address). The first is taken from a Windows Forms data binding application where Load is used to You define a front-end IP configuration that contains one or more public Reflecting on C++ executable files might throw a BadImageFormatException. ; If you have a vector property, apply the VectorType attribute to the property in your data model. Load columns as: Individual columns like Size and CurrentPrices in the HousingData class. Firstly, I want to load a Main Screen file from 'C:\MainScreen.xaml'. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Loads an Assembly given its AssemblyName. Specifies the name and path of the file to be loaded. The following Console application example first creates tables and loads data from a reader into a DataSet, using the Load method. An Azure load balancer is a Layer-4 (TCP, UDP) load balancer that provides high availability by distributing incoming traffic among healthy VMs. See http://go.microsoft.com/fwlink/?LinkId=155570 for more information. The service simulates traffic for your applications, regardless of where they're hosted. If you call this method more than once on the same assembly but with a different evidence specified, the common language runtime does not throw a FileLoadException because the equality and integrity of the different evidence specifications cannot be determined. More info about Internet Explorer and Microsoft Edge, Reading XML Data using XPathDocument and XmlDocument. The object placeholder represents an object expression that evaluates to an object in the Applies To list. WebLoad (String) Load (Byte [], Byte []) Overloads Load (Byte []) Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly. In this scenario, the user wants to initialize an empty DataTable with values from the primary data source. The service simulates traffic for your applications, regardless of where they're hosted. The long or short form of the assembly name. Remarks When an object is loaded, it is placed in memory, but isn't visible. The document begins loading at this point. For more information about handling events, see Handling and Raising Events. WebLoad-balancing options. Beginning with the .NET Framework 4, the trust level of an assembly that is loaded by using this method is the same as the trust level of the application domain. The URL can be either a local file or an HTTP URL (a Web address). In this case, the document remains empty. If the assembly is found using CodeBase, the display name is matched against the assembly. ; Multiple columns at a time in the form of a vector like HistoricalPrices in the HousingData class. Microsoft makes no warranties, express or implied, with respect to the information provided here. The loader does not continue probing for other assemblies that match the simple name. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. The specified path is invalid (for example, it is on an unmapped drive). Please use an overload of Load which does not take an Evidence parameter. Updates the current and original versions of the row with the value of the incoming row. The operation is attempted on an unloaded application domain. An array of type byte that is a COFF-based image containing an emitted assembly. Here are two examples of using Load. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Until an object is visible, a user can't interact with it. C# Copy public static System.Xml.Linq.XDocument Load (System.IO.Stream stream); Parameters stream Stream The stream that contains the XML data. An Azure load balancer is a Layer-4 (TCP, UDP) load balancer that provides high availability by distributing incoming traffic among healthy VMs. In addition, a DataTable can accept incremental data from one or more secondary data sources. Microsoft makes no warranties, express or implied, with respect to the information provided here. In this scenario, the user wants to take the DataSet filled in the previous scenario and perform an incremental synchronization with the primary data source, preserving modifications made in the DataSet. The expression should return true to load and false to unload the element. Finally, the example displays the contents of the tables in the console window. The techniques shown in this topic apply equally to models created with Code First and the EF Designer. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The XmlReader used to feed the XML data into the document. You define a front-end IP configuration that contains one or more public Next steps. Returns XDocument An XDocument object that reads the data that is contained in the stream. If no matching table is found, a table is created using the name supplied in the array of table names, and the new table's schema is inferred from the result set. Here are two examples of using Load. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overloading any single resource. A value from the LoadOption enumeration that indicates how rows already in the DataTable are combined with incoming rows that share the same primary key. If you call the Load method more than once on the same assembly but with a different evidence specified, the common language runtime does not throw a FileLoadException because the equality and integrity of the different evidence specifications cannot be determined. The assembly is loaded into the domain of the caller using the supplied evidence. If you select the Upsert option, it is assumed that the data is coming from one of a secondary data source, such as data provided by a middle-tier component, perhaps altered by a user. These scenarios describe standard usage for a DataTable, describing its update and merge behavior. The following example illustrates the use of a long name to load the System.dll assembly for the .NET Framework 4: Note: In .NET for Windows Store apps or the Portable Class Library, catch the base class exception, IOException, instead. The following example demonstrates how to use the SetDesktopLocation, Load, Activated, and Activate members. In each case, both events occur, and the action is the same for each. If the reader is positioned on a leaf node that is invalid for the root level of a document, for example a white space or attribute node, the reader continues to read until it is positioned on a node that can be used for the root. The following table displays behavior for the Load method. The Load method provides a technique for filling a single DataTable with data, retrieved from an IDataReader instance. Preserve changes and re-synchronize from the primary data source. Required for multi-sample textures. This file is in format. If both the AssemblyName.Name property and the AssemblyName.CodeBase property are set, the first attempt to load the assembly uses the display name (including version, culture, and so on, as returned by the Assembly.FullName property). This applies to the .NET Framework version 1.1 Service Pack 1 (SP1) and subsequent releases. The display name of the assembly. If both the AssemblyName.Name property and the AssemblyName.CodeBase property are set, the first attempt to load the assembly uses the display name (including version, culture, and so on, as returned by the Assembly.FullName property). The Load method makes all these scenarios possible. The FillErrorEventArgs parameter passed to the procedure provides properties that allow you to retrieve information about the error that occurred, the current row of data, and the DataTable being filled. The action may be applied to either the current or original version of each row, or both, depending on the current row state. This is most likely caused by the C++ compiler stripping the relocation addresses or the .reloc section from your executable file. Let me explain it again. The techniques shown in this topic apply equally to models created with Code First and the EF Designer. These scenarios describe standard usage for a DataTable, describing its update and merge behavior. The term load balancing refers to the distribution of workloads across multiple computing resources. Updates the original version of the row with the value of the incoming row. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overloading any single resource. The DataSet tracks changes, allowing synchronization with the primary data source. An array of strings, from which the Load method retrieves table name information. More info about Internet Explorer and Microsoft Edge, http://go.microsoft.com/fwlink/?LinkID=155570, http://go.microsoft.com/fwlink/?LinkId=155570. The following example demonstrates several of the issues involved with calling the Load method. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. This example shows how to use one of the overloaded versions of Load. Loads an assembly with the specified name. The Upsert option facilitates aggregating changes from one or more secondary data sources. If you set a custom template in a control during the Page_Load event, the text values of child controls in the custom template will be lost. If the current AppDomain object represents application domain A, and the Load method is called from application domain B, the assembly is loaded into both application domains. Loads the XML document from the specified stream. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Loading Elements There are several different ways to load the elements: Use an x:Bind expression to specify the load state. In each case, the Action property of the DataRowChangeEventArgs instance passed to the event handler contains information about the particular action associated with the event. The following example instantiates an AssemblyName object and uses it to load the sysglobal.dll assembly. Microsoft makes no warranties, express or implied, with respect to the information provided here. When converting data, the Load method uses the same conversion rules as the Fill method. WebLoad (Stream) Creates a new XDocument instance by using the specified stream. This action value depends on the state of the row before the load operation. The Load method attempts to find a table within the DataSet matching the name found in the array of table names, in order. Loads the assembly with a common object file format (COFF)-based image containing an emitted assembly. To load an assembly from a byte array with the trust level of the application domain, use the Load(Byte[], Byte[], SecurityContextSource) method overload. If rawSymbolStore was specified, the raw bytes that represent the symbols for the assembly are also loaded. To run the example, paste the following code in a form called Form1 containing a Button called Button1 and two Label controls called Label1 and Label2. The table below provides the details. Load balancer supports both inbound and outbound scenarios. If the current node and its siblings look like the following: Load throws an exception because a document cannot have two root level elements. Key scenarios that you can accomplish using Azure Standard Applies to See also Introduction to the ASP.NET Page Life Cycle Recommended content UpdatePanel (System.Web.UI) LinkButton (System.Web.UI.WebControls) Web See AssemblyName.ProcessorArchitecture. typeX denotes that there are four possible types: int, int2, int3 or int4. You define a front-end IP configuration that contains one or more public A IDataReader that provides a result set. FileLoadException is thrown if assemblyRef specifies the full assembly name, and the first assembly that matches the simple name has a different version, culture, or public key token. Developers, testers, and quality assurance (QA) engineers can use it to optimize application performance, scalability, or capacity. Use an overload that does not take an Evidence parameter. You can use this event to perform tasks such as allocating resources used by the form. rawAssembly was compiled with a later version of the common language runtime than the version that is currently loaded. filename is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars. When legacy CAS policy is not enabled, securityEvidence should be null. There are several scenarios where you may want to load entities from the database into the context without immediately doing anything with those entities. The long form of an assembly name consists of its simple name (such as "System" for the System.dll assembly) along with its version, culture, public key token, and optionally its processor architecture. Using this delegate mechanism, rather than a simpler try/catch block, allows you to determine the error, handle the situation, and continue processing if you like. Fills a DataTable with values from a data source using the supplied IDataReader. First, the example focuses on schema issues, including inferring a schema from the loaded IDataReader, and then handling incompatible schemas, and schemas with missing or additional columns. Loads the XML document from the specified XmlReader. The Load extension method works just like ToList except that it avoids the creation of the list altogether. The read only constraint on a DataColumn is applicable only for changes that occur in memory. Loading Elements There are several different ways to load the elements: Use an x:Bind expression to specify the load state. The trust level of an assembly that is loaded by using this method is the same as the trust level of the calling assembly. Call FindName with the name that you defined on the element. [in] A sampling index. The tables parameter allows you to specify an array of table names, indicating the order of the tables corresponding to each result set loaded from the reader. The following example uses the StringReader class to load a string of XML data into the XmlDocument object. Execute an extension by issuing the full !DLLName.ExtensionCommand syntax. The Load method consumes the first result set from the loaded IDataReader, and after successful completion, sets the reader's position to the next result set, if any. Load balancer supports both inbound and outbound scenarios. The loadOption parameter allows you to specify how you want the imported data to interact with existing data, and can be any of the values from the LoadOption enumeration. If you need to use a XmlDocument object to work with XML, you can use the XmlTextReader object to create one. These issues, and more, are controlled by the loadOption parameter. An I/O error occurred while opening the file. This method allows you to specify a load option parameter, indicating how rows already in a DataTable combine with rows being loaded. In each case, the description indicates the behavior when the primary key of a row in the incoming data matches the primary key of an existing row. When you use a Load method with a Byte[] parameter and Evidence to load a COFF image, only the supplied evidence is used. For information that is common to all overloads of this method, see the Load(AssemblyName) method overload. Returns If the debugger has not yet loaded DLLName .dll, it loads the DLL at this point if it is located in the current DLL search path. Returns XDocument An XDocument object that reads the data that is contained in the stream. Please use an overload of Load which does not take an Evidence parameter. The Load method consumes the first result set from the loaded IDataReader, and after successful completion, sets the reader's position to the next result set, if any. This method provides the same functionality, but allows you to load multiple result sets from an IDataReader into multiple tables within a DataSet. In the .NET Framework version 2.0, processor architecture is added to assembly identity, and can be specified as part of assembly name strings. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information. Should it modify current values, original values, or both? Until an object is visible, a user can't interact with it. Some information relates to prerelease product that may be substantially modified before its released. To specify a remote computer, include the computer name (in the format, Specifies the name and path of the file to be loaded. ; Multiple columns at a time in the form of a vector like HistoricalPrices in the HousingData class. (The overload that doesn't allow you to specify the behavior uses the default load option.) The default namespace associated with DataSet, if any, is associated with each newly created DataTable. The first is taken from a Windows Forms data binding application where Load is used to The assemblies that are loaded into the two application domains might be different if the path settings for the two application domains are different. The return type matches the type in the Object declaration. By default, legacy CAS policy is not enabled in the .NET Framework 4; when it is not enabled, securityEvidence must be null. The following example loads an assembly given its fully qualified name, and lists all the types contained in the specified assembly. The example then displays the full name of the assembly's public types. For this code example to run, you must provide the fully qualified assembly name. If a remote computer is specified, valid root keys are: HKLM and HKU. These scenarios describe standard usage for a DataTable, describing its update and merge behavior. Fills a DataTable with values from a data source using the supplied IDataReader using an error-handling delegate. Set the property to false to indicate that you wish to halt processing. An array of DataTable instances, from which the Load(IDataReader, LoadOption, FillErrorEventHandler, DataTable[]) method retrieves name and namespace information. Otherwise, the Load method uses the current version of the primary key field. The value of securityContextSource is not one of the enumeration values. An IDataReader that provides a result set. Before considering the behavior of the Load method in terms of data operations, consider that each row within a DataTable maintains both the current value and the original value for each column. The action may be applied to either the current or original version of each row, or both, depending on the current row state. Azure Load Testing Preview is a fully managed load-testing service that enables you to generate high-scale load. Preserve changes and re-synchronize from the primary data source. The raw bytes representing the symbols for the assembly are also loaded. Firstly, I want to load a Main Screen file from 'C:\MainScreen.xaml'. Fills a DataSet with values from a data source using the supplied IDataReader. If the registry key name contains a space, enclose the key name in quotes. Loads an assembly given its AssemblyName. If you specify the OverwriteChanges or PreserveChanges options when calling the Load method, then the assumption is made that the incoming data is coming from the DataTable's primary data source, and the DataTable tracks changes and can propagate the changes back to the data source.