如何從文本框中獲取SubstringValues

Question

len = int.Parse(tE1Clt.Text);

front=int.Prase(tE_Fstng.text);

string result = tE3_Series.Text.Substring(front, len);
tE1_Sub.Text = result.ToString();

我出錯了

[index and length must refer to a location within the string. Parameter name: `length`]

Answer 1

如果（TeInput.Text.Length> 1）{

            string Input = TeInput.Text, Store1 = string.Empty, store2 = string.Empty;
            int Start = 0, End = 0;
            Start = int.Parse(TeStart.Text);

            End = int.Parse(TeEnd.Text);
            string Output = TeOutput.Text;

            Store1 = Input.Remove(0, Start).Trim();
            store2 = Store1.Remove(Store1.Length-End).Trim();
            TeOutput.Text = store2;

Answer 2

你可以這樣

            var str = "----takemeout----";
            var start = str.IndexOf('t'); // start index of first t
            var length = 9; // length of takemeout string
            var result = str.Substring(start, length);

值或結果將是“ takemeout”