您可以在下面解释此代码吗? [英] Can you explain this code below?

问题描述

亲爱的所有人，

我不明白下面的代码.您想向我解释一下吗?
这是代码:

Dear all,

I do not understand the code below. Would you like to explain me about it?
Here is the code:

private void txtFirstName_Enter(object sender, EventArgs e)
        {
            TextBox txt = (TextBox)sender;
            string t = txt.Name.Substring(3, txt.Name.Length - 3);
            if (txt.Text.ToLower() == t.ToLower())
            {
                txt.ForeColor = System.Drawing.Color.Black;
                txt.Text = "";
            }
        }

        private void txtFirstName_leave(object sender, EventArgs e)
        {
            TextBox txt = (TextBox)sender;
            string t = txt.Name.Substring(3, txt.Name.Length - 3);
            if (txt.Text.ToLower() == t.ToLower() || txt.Text == "")
            {
                txt.ForeColor = System.Drawing.Color.Silver;
                txt.Text = t;

            }
            else
            {
                txt.ForeColor = System.Drawing.Color.Black;
            }
        }

非常感谢.

Thank you so much.

推荐答案

string t = txt.Name.Substring(3, txt.Name.Length - 3);

阅读文档不难理解
http://msdn.microsoft.com/en-us/library/aka44szs.aspx [ ^ ]

Not difficult to understand if you read the documentation
http://msdn.microsoft.com/en-us/library/aka44szs.aspx[^]

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