如何验证Windows应用程序中组合的文本框组合框和日期时间选择器 [英] how to validate textbox combobox and datetimepicker combined in windows application

问题描述

请有人告诉我如何在Windows应用程序中一次验证所有文本框，组合框和日期时间选择器

我已经尝试过使用单个文本框，但是我不知道如何验证单个表单中的所有控件.
我验证一个文本框控件的代码是

Please some one tell me how to validate all text box, combo box and date time pickers at once in windows application

I have tried for single text box, but I don''t know how to validate all controls in a single form.
My code to validate one text box control is

private void txtcmpname_Validating(object sender, CancelEventArgs e)
{
	if (((TextBox)sender).Text == "")
	{
		MessageBox.Show("You must enter a ccomplaintname.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
		e.Cancel = true;
	}
}

但是，每当我添加另一个文本框或组合框验证时，它都无法正常工作，并且在数据库中插入了一条空白记录.

请向我提供解决方案

But whenever I added another text box or combo box validation then that is not working properly and a blank record is inserted in the database.

Please provide me the solution

推荐答案

要真正理解您的问题，我需要知道如何自动更新数据库的代码.为了响应用户的某些行为?

为什么不能使用单个类范围的布尔变量，例如:

私人布尔IsAllControlsVerified = false;

最初将其设置为"false"，然后在每次更新数据库后将其重置为"false"，然后具有一个功能，用于对要验证的每个控件进行测试，并且，只有在所有控件都经过验证的情况下，才将此标志设置为''真的 ?

当然，仅当此标志为"true"时，才允许继续进行数据库更新.

请扩大对您要做什么的解释.

To really understand your question, I''d need to know how the code that updates the database is called ... automatically ? In response to some user action ?

Why can''t you use a single class-scoped boolean variable, something like:

private bool IsAllControlsVerified = false;

which is set to ''false'' initially, and then reset to ''false after each database update, and then have a function that tests for each control being validated, and, only if all of them are validated, sets this flag to ''true ?

The database update, of course, being allowed to proceed only if this flag if ''true.

Please expand your explanation of what you are trying to do.

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