如何获取文本框文本的前 3 个字符？

Question

How do I get the first 3 characters of the text in a textbox?

For example, textBox1.Text = "HITHEREGUYS"

When I get the first 3 characters, it should show HIT .

Answer 1

string result = textBox1.Text.Substring(0,3);

使用子串

Answer 2

Text lower than 3 characters will throw an exception. So check text length first:

string result = textBox1.Text.Length <= 3 ? textBox1.Text : textBox1.Text.Substring(0, 3);

Answer 3

这里基本上是你得到它的方式：

LEFT(textbox1.text, 3)