字符串和系统窗口表单对话框之间没有隐式转换

Question

I am getting error. I like to show message dialog if cell is empty after click a button

 var name = dataGridView1.Rows[0].Cells[1].Value != null ? dataGridView1.Rows[0].Cells[1].Value.ToString() : MessageBox.Show("Cell is empty") ;

Answer 1

You can't do it like that.Because the documentation says:

Either the type of first_expression and second_expression must be the same , or an implicit conversion must exist from one type to the other.

Use an if statement instead:

string name;
if(dataGridView1.Rows[0].Cells[1].Value == null)
{
   MessageBox.Show("Cell is empty");
}
else
{
   name = dataGridView1.Rows[0].Cells[1].Value.ToString();
}

Answer 2

Please do not ever do this, Selman22's answer should be the way to go.

But just for fun: (return value "OK", "Cancel" etc when Message Box is shown)

var name = dataGridView1.Rows[0].Cells[1].Value != null ? dataGridView1.Rows[0].Cells[1].Value.ToString() : new Func<string>(() => MessageBox.Show("Cell is empty").ToString())();