如何在用户控件中公开 TextBox 文本属性

Question

我希望有人可以帮助我确定我一定是一个愚蠢的错误。

我已将我正在处理的用户控件拆分为基本元素。我在用户控件上放置了一个文本框并公开文本框文本属性我创建了以下内容

[Browsable(true)]
    public override string Text 
    { 
        get
        {
            return textBox1.Text;
        }
        
        set
        {
            textBox1.Text = value;
        }
    
    }

似乎一切正常，只有一个例外。当我将控件放在窗体上时，文本框会显示控件的名称，即控件 1。我试过如下设置属性默认属性不影响。

DefaultValue((string)null),

如何停止控件显示控件名称？

感谢您的建议。

Answer 1

此问题的解决方案是自定义 ParentControlDesigner where you can override the InitializeNewComponent 方法来设置或清除 Text 属性。

例子

using System;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Security.Permissions;

namespace YourProject
{
    [DefaultProperty(nameof(Text))]
    [DefaultEvent(nameof(TextChanged))]
    [Designer(typeof(MyUserControlDesigner))]
    public partial class MyUserControl : UserControl
    {
        public MyUserControl()
        {
            InitializeComponent();

            // Update the base.Text whenever the TextBox.Text property is changed.
            textBox1.TextChanged += (s, e) =>
            {
                if (textBox1.Text != Text) Text = textBox1.Text;
            };
        }

        // Get and set the text of the base property instead of the TextBox's
        // to get the TextChanged event raised.
        [Browsable(true),
            EditorBrowsable(EditorBrowsableState.Always),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public override string Text
        {
            get => base.Text;
            set => base.Text = value;
        }

        protected override void OnTextChanged(EventArgs e)
        {
            // Update the TextBox.Text property whenever the base property is changed.
            if (Text != textBox1.Text) textBox1.Text = Text;
            base.OnTextChanged(e);
        }

        // If you need to handle the TextChanged event...
        /// <inheritdoc cref="Control.TextChanged"/>
        [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
        public new event EventHandler TextChanged
        {
            add { base.TextChanged += value; }
            remove { base.TextChanged -= value; }
        }
    }

    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
    public class MyUserControlDesigner : ParentControlDesigner
    {
        public override void InitializeNewComponent(IDictionary defaultValues)
        {
            base.InitializeNewComponent(defaultValues);

            if (Component is MyUserControl c) c.Text = "StephenH"; // c.Text = "";
        }
    }
}

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如何在用户控件中公开 TextBox 文本属性