如何在文本框中包含一些数据时禁用文本框，而在c#中没有数据时则不禁用 [英] how to disable a textbox when it has some data and not disable if it has no data in c#

问题描述

嘿，任何人都可以告诉我，我正在搜索一条记录并将其显示在文本框中.一些文本框已填充，但某些文本框未填充，因为它们在数据库中不支持这些列的数据.我的问题是我想禁用具有数据的文本框，并保持启用没有日期进行进一步更新的那些文本框.
请事先帮助

hey can any body tell me that i am searching a record and showing them in textbox. Some textboxes Are filled but some not because their is no data avilable in the datbase to those column. My problem is that i want to disable the textboxes which has data and keep enable those textboxes which have no date for further update.
pls help thanks in advance

推荐答案

不是textbox.Enabled = false吗?我在这里缺少什么吗?

Doesn''t textbox.Enabled = false do it? Am I missing something here?

textBox.Enable = (string.IsNullOrEmpty(textBox.Text));

其他答案还不够.您应该以某种方式触发对内容的检查.唯一的方法是处理事件

The other answers are not enough. You should trigger the check of the content somehow. The only way to do it is handling the event

myTextBox.TextChanged += delegate(object sender, EventArgs e) {
    TextBox textBox = (TextBox)sender;
    textBox.Enabled = string.IsNullOrEmpty(textBox.Text);
};

现在，让我告诉您:这是一个陷阱.删除文本后，将无法再编辑文本框.你不怕:-)?

我不确定您是否要以这种方式触发这些操作，至少我是给您这个主意的.毕竟，您可以使用textBox.Enabled = true使用其他控件重新启用文本框.我希望(从您的问题中可以看到)，一些更新来自数据库.在这种情况下，获取非空数据可以根据需要重新启用文本框.

—SA

Now, let me tell you: this is a trap. As soon as you delete the text, your text box cannot be edited anymore. Are you not afraid :-)?

I''m not sure you want to trigger this stuff in this way, at least I gave you the idea. After all, you can re-enable the text box using some other control with textBox.Enabled = true. I hope (as much as I can see from your Question), some updates are coming from the database; in this case getting non-empty data can re-enable the text box as you need.

—SA

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