如何将textarea数据存入数据库？解决@detail参数未提供异常

Let's break down and fix this issue quickly:

Root Cause #

The error pops up because your code is trying to fetch the textarea's value using the wrong key in Request.Form, which results in a null value being passed to the @detail parameter of your stored procedure. Since the stored procedure requires this parameter, it throws the exception you're seeing.

Step-by-Step Fixes #

1. Correct the Request.Form Key

In your Movies.aspx.cs file, you're using Request.Form["txtCommentBox_1"] to get the textarea content, but your textarea's name attribute is txtCommentBox (not txtCommentBox_1).

Change this line:

string text = Request.Form["txtCommentBox_1"];

To this:

// Get the value, default to empty string if it's null
string text = Request.Form["txtCommentBox"] ?? string.Empty;

2. (Optional but Recommended) Use Server-Side Control for Reliability

Instead of relying on Request.Form, convert the textarea to an ASP.NET server control by adding runat="server". This makes accessing its value more straightforward and less error-prone.

Update the textarea in Movies.aspx:

<textarea id="txtCommentBox" name="txtCommentBox" runat="server" rows="6" style="width:340px;" 
onKeyDown="textCounter(this.form.txtCommentBox,this.form.countDisplay);" 
onKeyUp="textCounter(this.form.txtCommentBox,this.form.countDisplay);"></textarea>

Then in Movies.aspx.cs, replace the Request.Form line with:

string text = txtCommentBox.Value ?? string.Empty;

3. Verify Parameter Handling

Ensure that even if the user leaves the textarea empty, you're passing a valid value (not null) to the stored procedure. The ?? string.Empty in the code above ensures this, so the @detail parameter will always receive a valid string (even if it's empty).

Final Check #

After making these changes, test the upload functionality again. The @detail parameter will now be properly supplied with the textarea's content (or an empty string if nothing was entered), and the exception should be resolved.

内容的提问来源于stack exchange，提问作者Suhel shaikh