c# - 如何从 DateTimePicker 控件(Windows 窗体控件)中删除 "Today"按钮

Question

在 DateTimePicker 控件中，当我们单击下拉按钮时，会显示一个日历。在日历的底部，有一个按钮:今天，点击它，将当前日期设置为所选日期。我想从控件中删除/隐藏该按钮。我该怎么做？

Answer 1

native Windows DateTimePicker 控件支持DTM_SETMCSTYLE 消息来设置月份日历的样式。您只需要一点 pinvoke 即可在创建控件时发送消息并更改默认样式。向您的项目添加一个新类并粘贴如下所示的代码。编译。将工具箱顶部的新控件拖放到窗体上，替换旧控件。

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

class MyDateTimePicker : DateTimePicker {
    protected override void OnHandleCreated(EventArgs e) {
        int style = (int)SendMessage(this.Handle, DTM_GETMCSTYLE, IntPtr.Zero, IntPtr.Zero);
        style |= MCS_NOTODAY | MCS_NOTODAYCIRCLE;
        SendMessage(this.Handle, DTM_SETMCSTYLE, IntPtr.Zero, (IntPtr)style);
        base.OnHandleCreated(e);
    }
    //pinvoke:
    private const int DTM_FIRST = 0x1000;
    private const int DTM_SETMCSTYLE = DTM_FIRST + 11;
    private const int DTM_GETMCSTYLE = DTM_FIRST + 12;
    private const int MCS_NOTODAYCIRCLE = 0x0008;
    private const int MCS_NOTODAY = 0x0010;

    [DllImport("user32.dll")]
    private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
}

在 Windows 7 上运行时看起来像这样: