C＃WinForm中字符串的长度

Question

I have a text box in my form and I want to check if the first char is equal to something,
basically I want it to do this :

if(Textbox1.text.length(0) == "a")
{
  do stuff
}

Answer 1

.length only returns an integer of length of the string. This will compare the first char with 'a'.

if(Textbox1.text[0] == 'a')

Answer 2

Eh, are you looking for

  if (Textbox1.Text.StartsWith("a")) {
    // do stuff
    ...
  }

Answer 3

you can do this by two ways... one i mentioned in your question's comment
second is

if(myTextBox.Text[0] == 'B')
{
//do studd
}

Answer 4

try smething like this:

Textbox1.Text.StartsWith("a") ? do something : do something else;

and if it is not just about first character then try something like:

Textbox1.Text.Contains("a") ? do something : do something else;

Answer 5

if（textBox1.Text.Substring（0,1）==“ a”）