Provides data for the ContextCreating event.
System.EventArgs
System.Web.UI.WebControls.LinqDataSourceContextEventArgs
Namespace: System.Web.UI.WebControls
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
Public Class LinqDataSourceContextEventArgs _ Inherits EventArgs
public class LinqDataSourceContextEventArgs : EventArgs
public ref class LinqDataSourceContextEventArgs : public EventArgs
type LinqDataSourceContextEventArgs = class inherit EventArgs end
The LinqDataSourceContextEventArgs type exposes the following members.
| Name | Description | |
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LinqDataSourceContextEventArgs() | Initializes a new instance of the LinqDataSourceContextEventArgs class. |
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LinqDataSourceContextEventArgs(DataSourceOperation) | Initializes a new instance of the LinqDataSourceContextEventArgs class for the specified data operation. |
| Name | Description | |
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ObjectInstance | Gets or sets the data context object to create. |
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Operation | Gets the data operation that is being performed. |
| Name | Description | |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
By default, the LinqDataSource control creates an instance of the type that is specified in the ContextTypeName property. The LinqDataSource control calls the default constructor of the data context object to create an instance of the object.
You can manually create the data context object by handling the ContextCreating event. You do this if you want to use a non-default constructor.
You can also handle the ContextCreating event if you want to create a data context object that is different from the one specified in the ContextTypeName property. In that case, you set the ObjectInstance property to the object you created. The LinqDataSource control will use the object you have created for selecting the data. When you are updating, inserting, or deleting data, you must set the ObjectInstance property to an object that derives from the DataContext class.
The following example shows how to create the data context object by calling a non-default constructor in an event handler for the ContextCreating event. The code assigns the custom object to the ObjectInstance property.
Protected Sub LinqDataSource_ContextCreating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LinqDataSourceContextEventArgs) e.ObjectInstance = New ExampleDataContext(ConfigurationManager.ConnectionStrings("ExampleConnectionString").ConnectionString) End Sub
protected void LinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e) { e.ObjectInstance = new ExampleDataContext(ConfigurationManager.ConnectionStrings["ExampleConnectionString"].ConnectionString); }
.NET Framework
Supported in: 4, 3.5Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.