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HtmlForm.RenderAttributes Method

Renders the HtmlForm control's attributes to the specified HtmlTextWriter object.

Namespace:  System.Web.UI.HtmlControls
Assembly:  System.Web (in System.Web.dll)

'Declaration
Protected Overrides Sub RenderAttributes ( _
	writer As HtmlTextWriter _
)

Parameters

writer
Type: System.Web.UI.HtmlTextWriter

The HtmlTextWriter that receives the rendered content.

ExceptionCondition
InvalidOperationException

The control ID set in the DefaultButton property is not of the type IButtonControl.

The RenderAttributes method uses the IsValidFormAttribute method to check the HtmlForm control's attributes to ensure that they can be rendered in the opening tag of a <form> HTML element.

Additionally, the RenderAttributes method renders the method, action, and onsubmit attributes of the HtmlForm control. If the control ID set in the DefaultButton property does not implement the IButtonControl interface, an InvalidOperationException exception is thrown.

The RenderAttributes method is used primarily by control developers extending the functionality of the HtmlForm control.

Notes to Inheritors

When overriding the RenderAttributes method in a derived class, be sure to call the base class's RenderAttributes method so that the HtmlForm control's attributes are correctly rendered.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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