如何遍历所有 textBox 控件并更改关联的标签颜色 [英] How to loop through all textBox controls and change associated label color

问题描述

        foreach (Control c in this.Controls)
        {
           if (c is TextBox && c.Text.Length==0)
           {
               // [Associatedlabel].ForeColor = System.Drawing.Color.Red;
               err = true;
           }

而不是[Associatedlabel]，我想将每个文本框与标签相关联，所以最终文本框附近的所有标签都是空的，都是红色的，怎么做?谢谢.

instead of [Associatedlabel], I want to associate each textbox to label, so eventually all labels near the textbox that are empty will be red, how it can be done? Thanks.

推荐答案

您可以先手动将 TextBox 的 Tag 属性设置为这些标签.标签旨在包含用户定义的数据，因此您可以在其中放置任何 object.然后你可以简单地做:

You can first manually set your TextBox's Tag property to these labels. Tag is meant to contain user-defined data, so you can place any object there. Then you can do simply:

foreach (Control c in this.Controls)
{
    if (c is TextBox && c.Text.Length==0 && c.Tag is Label)
    {
        ((Label)c.Tag).ForeColor = System.Drawing.Color.Red;
        err = true;
    }
}

这是最简单的解决方案，但还有一些更复杂的解决方案.

This is the simplest solution, but a few more sophisticated exists though.

1. 创建一个包含标签、文本框和自定义行为的自定义复合控件；
2. 创建一个源自文本框的控件，该控件存储有关与其连接的标签的信息(如 Hans Passant 建议的那样)
3. 创建一个 Dictionary 或 Dictionary，允许在运行时解决此类问题(Steve 的想法有所不同).

1. Creating a custom composite control consisting of a label, textbox and custom behavior;
2. Creating a control deriving from a textbox, which stores information about label it is connected with (as Hans Passant suggests)
3. Creating a Dictionary<TextBox, Label> or Dictionary<Control, Label>, which allows resolving such matters in runtime (variation on Steve's idea).

这篇关于如何遍历所有 textBox 控件并更改关联的标签颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！