运算符'=='不能应用于'方法组'类型的操作数

Question

I have following function which returns true or false :

public bool ValidateURL()
{
   if (string.IsNullOrEmpty(txt22.Text) & string.IsNullOrEmpty(txt33.Text))
   {
      return false;
   }
   else 
   {
      return true;
   }
}

Now following code is on a button but I am getting " Operator cannot be applied " error:

private void btn33_Click(object sender, EventArgs e)
{
   if (ValidateURL==true)
   {
      MessageBox.Show("Enter data");
   }
}

How can i fix it?

Answer 1

private void btn33_Click(object sender, EventArgs e)
{
    if (ValidateURL())
    {
        MessageBox.Show("Enter data");
    }
}

EDIT:

As Cody Gray pointed out, there's no real point in comparing "true" and the value returned by ValidateURL() ( ValidateURL() == true ). Nobody really does it and it just makes the code longer. When I answered the question, I just quickly copied, pasted and fixed OP's problem and this is why the comparison was there. While absolutely valid, it's not really needed. +1 Cody.

Answer 2

将其更改为：

if (ValidateURL())

Answer 3

Change

if (ValidateURL==true)

to

if (ValidateURL() ==true)

Answer 4

You need parentheses. Should be ValidateURL() == true

Answer 5

你要

if (ValidateURL() == true)

Answer 6

A Google search of this error led me here. In my case, it was because I was referencing a new property in an ASP.NET MVC Razor page. The property had been added to my model, but I had forgotten to compile the project. The Razor compiler couldn't find the property, and was assuming I was trying to reference an extension method.

Once I compiled, the error cleared up.