c# - 字符串格式 : remove the last underscore and the following characters

Question

我有一个字符串列表

 A_1
 A_2
 A_B_1
 X_a_Z_14

我需要删除最后一个下划线和后面的字符。

所以结果列表会像

A
A
A_B
X_a_Z

Answer 1

var data = new List<string> {"A_1", "A_2", "A_B_1", "X_a_Z_14"};

int trimPosition;
for (var i = 0; i < data.Count; i++)
         if ((trimPosition = data[i].LastIndexOf('_')) > -1)
            data[i] = data[i].Substring(0, trimPosition);