如何在Winform应用程序中阻止用户在Combobox中编写 [英] How Do I Prevent The User From Writing In Combobox In Winform App

问题描述

我的winform应用程序中有出生日期的组合boxex，这些框中的默认文本是日，月和年，我如何阻止用户写入它以及如何在没有值的情况下执行检查未从组合框中选择??

i have combo boxex for date of birth in my winform app,the default text in these boxes are day,month and year,how can i prevent the user from writing in it and how can i perform check if none of the value is not selected from comboboxes??

推荐答案

在设计器视图中将组合框的 DropDownStyle 属性设置为 DropDownList 或按代码：

In designer view set your combo box's DropDownStyleproperty to DropDownList or by code:

myCombo.DropDownStyle = ComboBoxStyle.DropDownList;

您可以通过选中 SelectedIndex 或 SelectedValue 属性来检查是否选择了某个值，这取决于您如何将数据填充到组合框中。

You can check whether some value is selected or not by checking SelectedIndex or SelectedValue property, it depends on how do you fill data into your combo boxes.

if(myCombo.SelectedIndex != -1)
{
    //do something
}

//or

if(myCombo.SelectedValue != null)
{
    //do something
}

设置您的组合为DropDownList：

Set your combo as DropDownList:

this.comboBoxType.DropDownStyle = ComboBoxStyle.DropDownList;

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