HtmlForm.RenderAttributes(HtmlTextWriter) Method

Definition

Namespace:

System.Web.UI.HtmlControls

Assembly:

System.Web.dll

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

protected:
 override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);

protected override void RenderAttributes (System.Web.UI.HtmlTextWriter writer);

override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unit

Protected Overrides Sub RenderAttributes (writer As HtmlTextWriter)

Parameters

writer

HtmlTextWriter

The HtmlTextWriter that receives the rendered content.

Exceptions

InvalidOperationException

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

Remarks

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

See also

• RenderAttributes(HtmlTextWriter)
• IsValidFormAttribute(String)
• DefaultButton
• IButtonControl
• InvalidOperationException