如何通过删除MVC EditorFor Form上的HTML标记来替换textarea中的文本

Question

I have a field in my database called emailhtml where I save a plain text email string from a textarea called plaintext. I save the \\n etc by using:

string test = plaintext.Replace(System.Environment.NewLine, "<br />");

Now in my EditorFor form I want to be able to display the field with the include line breaks etc but I cannot seem to work out how to do so. I have tried:

@Html.TextAreaFor(c => c.Campaign.OwnHtml.Replace("<br />",System.Environment.NewLine ), new {rows="20", cols="20"})

But this results in an InvalidOperationException:

Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.

Answer 1

You can use as shown below as well :

@{
    var text = Model.Campaign.OwnHtml.Replace("<br />", System.Environment.NewLine);
}

@Html.TextArea("textArea", text, new { rows = "20", cols = "20" })

Answer 2

It looks like the problem is that you aren't allowed to call .Replace() inside your lambda expression there. You need to bind directly to a property.

Try adding another property to whatever class your 'c' corresponds to. For example:

public string OwnHtmlWithLineBreaks
{
    get
    {
        return OwnHtml.Replace("<br />", System.Environment.NewLine);
    }
}

Then in your view, change your TextAreaFor line to the following, binding to the new computed property:

@Html.TextAreaFor(c => c.Campaign.OwnHtmlWithLineBreaks, new { rows = "20", cols = "20" })