HtmlForm.RenderAttributes Method (HtmlTextWriter)


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

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

protected override void RenderAttributes(
	HtmlTextWriter writer


Type: System.Web.UI.HtmlTextWriter

The HtmlTextWriter that receives the rendered content.

Exception Condition

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
Available since 1.1
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