系统的EDIT怎么设置仅允许小数，仅允许十六进制数等限制？

[饺子87]

我写的只允许输入数字（包括小数点）的

using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Runtime.InteropServices;

namespace SaderControl
{

        ///<summary>
        ///OnlyNumberTextBox class
        ///</summary>
        
    [Designer(typeof(OnlyNumberTextBox.OnlyNumberTextBoxDesigner))]
    public class OnlyNumberTextBox:System.Windows.Forms.TextBox
    {
        #region Static Fields

        [DllImport("user32.dll")]
        private static extern bool MessageBeep(uint uType);
            
        #endregion        

        #region Method Overrides

        protected override bool ProcessKeyEventArgs(ref Message m)
        {
            int keyValue = m.WParam.ToInt32();
            //(keyValue>47&&keyValue<58)    [0-9]
            //keyVale==46   小数点
            //(keyValue>34&&keyValue<41)    Home,End,方向键
            //keyVale==8    回格键
            if (keyValue > 47 && keyValue < 58
                || keyValue == 46
                || (keyValue > 34 && keyValue < 41)
                || keyValue == 8)
            {
                return base.ProcessKeyPreview(ref m);
            }
            else 
            {
                if (m.Msg == 256 && keyValue == 46)
                {
                    return base.ProcessKeyPreview(ref m);
                }

                if (m.Msg == 258)
                {
                    MessageBeep(0);
                }
                return true;
            }
        }

        #endregion        

        #region internal Classes

        ///<summary>
        ///OnlyNumberTextBoxDesigner class
        ///</summary>

        internal class OnlyNumberTextBoxDesigner : ControlDesigner
        {

            #region Method Overrides

            protected override void PreFilterProperties(System.Collections.IDictionary properties)
            {
                properties.Remove("Text");
            }

            #endregion

        }

        #endregion


    }
}

ChrisAK ：（不支持小数）
既然都用PInvoke调用API了再做那么多没必要.
系统的EDIT本身就有只允许输入数字的功能.
你只要把ES_NUMBER给TextBox加上就可以了.

C# codeusing System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Runtime.InteropServices;


class NumberTextBox:TextBox 
{
    [DllImport("user32.dll")]
    static extern int SetWindowLong(IntPtr hWnd,int nIndex, int dwNewLong); 
    [DllImport("user32.dll")]
    static extern int GetWindowLong(IntPtr hWnd,int nIndex); 
    
    const int  GWL_STYLE = (-16);
    const int ES_NUMBER = 0x2000;
    protected override void OnCreateControl  ()
    {
        base.OnCreateControl ();
        int style= GetWindowLong (Handle,GWL_STYLE);
        SetWindowLong (Handle,GWL_STYLE,style|ES_NUMBER);
    }
}
class test:Form
{
    public test()
    {
        NumberTextBox nt = new NumberTextBox();
        Controls.Add (nt);
    }
    static void Main ()
    {
        Application.EnableVisualStyles();
        Application.Run (new test());
    }
}

你用CSC编译这段代码试试.
在XP之后的系统还会弹出一个提示说只能输入数字.
比自己写的要好得多.

[长沙三毛]

定制C# TextBox中只允许输入数字的解决方法

[饺子87]

前辈，见到你两次了，表老发这个连接了。这个我知道了。
ChrisAK说的方法似乎更简便，就是不知道有没有对应功能。

[conan19771130]

恩

[饺子87]

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[饺子87]

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