LinqDataSourceContextEventArgs Class

 

Provides data for the ContextCreating event.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

System.Object
  System.EventArgs
    System.Web.UI.WebControls.LinqDataSourceContextEventArgs

public class LinqDataSourceContextEventArgs : EventArgs

NameDescription
System_CAPS_pubmethodLinqDataSourceContextEventArgs()

Initializes a new instance of the LinqDataSourceContextEventArgs class.

System_CAPS_pubmethodLinqDataSourceContextEventArgs(DataSourceOperation)

Initializes a new instance of the LinqDataSourceContextEventArgs class for the specified data operation.

NameDescription
System_CAPS_pubpropertyObjectInstance

Gets or sets the data context object to create.

System_CAPS_pubpropertyOperation

Gets the data operation that is being performed.

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

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 void LinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
{
    e.ObjectInstance = new ExampleDataContext(ConfigurationManager.ConnectionStrings["ExampleConnectionString"].ConnectionString);
}

.NET Framework
Available since 3.5

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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