无法使用iframe代码设置文本框

Question

I am trying to display a textbox on UI where the value of the textbox is initialized to the following.

Here is my code.

...
<asp:TextBox ID="txtTest" runat="server" Visible="true" />
...
protected void Page_Load(object sender, EventArgs e)
{
    txtTest.Text = "<iframe width=\"100%\" height=\"300\" src=\"//jsfiddle.net/vhyseni/rj0tv76x/embedded/\" allowfullscreen=\"allowfullscreen\" frameborder=\"0\"></iframe>"
}

However the textbox is empty on page load. If I misspell iframe or use some other text (even eg "hello") the textbox is initialized correctly. Is there some issue with asp textbox that makes this string invalid?

Answer 1

您必须先对HTML进行编码，然后再将其分配给txtTest.Text

txtTest.Text = Server.HtmlEncode("you html");