在某些字符串的位置C＃插入值？ [英] C# Insert value in certain position in string?

问题描述

我期待从一个文本框的值时可以说12在一个字符串临时变量某一个地方。然后我想放置后说10，但与另一个值：像一个时间之间。 。都来自文本框和进行验证，使他们只能是数字。

i'm looking to place a value from a text box lets say "12" to a certain place in a string temp variable. Then i want to place another value after that say "10" but with a : in between like a time. Both come from Text boxes and are validated so they can only be numbers.

推荐答案

您不能修改字符串;他们是不可改变的。你可以这样做，而不是：

You can't modify strings; they're immutable. You can do this instead:

txtBox.Text = txtBox.Text.Substring(0, i) + "TEXT" + txtBox.Text.Substring(i);

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