C#中的文本框问题(winforms) [英] textbox problem in C# (winforms)

问题描述

我希望文本框中的值仅插入一次

此后未插入该值

I want that the value in a text box is inserted only once

After that the value does not inserted

推荐答案

一旦文本框失去焦点并且其文本长度大于0，则将其设置为只读.

As soon as the textbox loses focus and its text''s length is greater than 0, make it read only.

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