如何引用 HTML 的输入<textarea>控制代码隐藏？

Question

I'm using a textarea control to allow the user to input text and then place that text into the body of an e-mail. In the code behind, what is the syntax for referencing the users input? I thought I could just use message.Body = test123.Text; but this is not recognized.

HTML:

<textarea id="TextArea1" cols="20" rows="2" ></textarea>

CodeBehind:

foreach (string recipient in recipients)
{         
  var message = new System.Net.Mail.MailMessage("sender@example.com", recipient);
  message.Subject = "Hello World!";         
  message.Body = test123.Text;                
  client.Send(message); 
} 

Answer 1

You are not using a .NET control for your text area. Either add runat="server" to the HTML TextArea control or use a .NET control:

Try this:

<asp:TextBox id="TextArea1" TextMode="multiline" Columns="50" Rows="5" runat="server" />

Then reference it in your codebehind:

message.Body = TextArea1.Text;

Answer 2

You need to use runat="server" like this:

<textarea id="TextArea1" cols="20" rows="2" runat="server"></textarea>

You can use the runat=server attribute with any standard HTML element, and later use it from codebehind.

Answer 3

First make sure you have the runat="server" attribute in your textarea tag like this

<textarea id="TextArea1" cols="20" rows="2" runat="server"></textarea>

Then you can access the content via:

string body = TextArea1.value;

Answer 4

You should reference the textarea ID and include the runat="server" attribute to the textarea

message.Body = TextArea1.Text;  

What is test123 ?

---

Answer 5

缺少属性runat="server"或在代码中使用Request.Params["TextArea1"]