在.NET
中(至少在2008版本中,也可能在2005年),更改BackColor
的{{1}}属性对外观完全没有影响。如何更改文本区域的背景颜色,而不是下拉日历的背景颜色?
编辑: 我说的是Windows表单,而不是ASP。
答案 0 :(得分:15)
根据MSDN:
设置
BackColor
对此没有影响DateTimePicker
的外观。
您需要编写一个扩展DateTimePicker
的自定义控件。覆盖BackColor
属性和WndProc
方法。
每当您更改BackColor
时,请不要忘记调用myDTPicker.Invalidate()
方法。这将强制使用指定的新颜色重绘控件。
const int WM_ERASEBKGND = 0x14;
protected override void WndProc(ref System.Windows.Forms.Message m)
{
if(m.Msg == WM_ERASEBKGND)
{
using(var g = Graphics.FromHdc(m.WParam))
{
using(var b = new SolidBrush(_backColor))
{
g.FillRectangle(b, ClientRectangle);
}
}
return;
}
base.WndProc(ref m);
}
答案 1 :(得分:4)
有一个源自DateTimePicker
的免费实现,允许您在更改时更改BackColor
属性。
请参阅CodeProject网站:DateTimePicker
with working BackColor
答案 2 :(得分:2)
对于文本区域,您可以在将扩展器添加到实际文本框上的情况下执行此操作 对于c#,你会这样做:
<asp:TextBox runat="server" ID="txt" BackColor="Aqua" Text="Date"></asp:TextBox>
答案 3 :(得分:2)
基于此CodeProject:A DateTimePicker with working BackColor(如上所述)我已经重写了一个自定义日期选择器类(在VB.NET中),它允许自定义背景颜色,TextColor和旁边出现的小图像下拉按钮。
Eg.1:
Eg.2:
要使其正常工作,只需使用以下代码在项目中创建一个新类,然后重新构建解决方案
现在,名为MyDateTimePicker
的新控件应显示在工具箱列表中:
Public Class MyDateTimePicker
Inherits System.Windows.Forms.DateTimePicker
Private _disabled_back_color As Color
Private _image As Image
Private _text_color As Color = Color.Black
Public Sub New()
MyBase.New()
Me.SetStyle(ControlStyles.UserPaint, True)
_disabled_back_color = Color.FromKnownColor(KnownColor.Control)
End Sub
''' <summary>
''' Gets or sets the background color of the control
''' </summary>
<Browsable(True)>
Public Overrides Property BackColor() As Color
Get
Return MyBase.BackColor
End Get
Set
MyBase.BackColor = Value
End Set
End Property
''' <summary>
''' Gets or sets the background color of the control when disabled
''' </summary>
<Category("Appearance"), Description("The background color of the component when disabled")>
<Browsable(True)>
Public Property BackDisabledColor() As Color
Get
Return _disabled_back_color
End Get
Set
_disabled_back_color = Value
End Set
End Property
''' <summary>
''' Gets or sets the Image next to the dropdownbutton
''' </summary>
<Category("Appearance"),
Description("Get or Set the small Image next to the dropdownbutton")>
Public Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
_image = Value
Invalidate()
End Set
End Property
''' <summary>
''' Gets or sets the text color when calendar is not visible
''' </summary>
<Category("Appearance")>
Public Property TextColor As Color
Get
Return _text_color
End Get
Set(value As Color)
_text_color = value
End Set
End Property
Protected Overrides Sub OnPaint(e As System.Windows.Forms.PaintEventArgs)
Dim g As Graphics = Me.CreateGraphics()
g.TextRenderingHint = Drawing.Text.TextRenderingHint.ClearTypeGridFit
'Dropdownbutton rectangle
Dim ddb_rect As New Rectangle(ClientRectangle.Width - 17, 0, 17, ClientRectangle.Height)
'Background brush
Dim bb As Brush
Dim visual_state As ComboBoxState
'When enabled the brush is set to Backcolor,
'otherwise to color stored in _disabled_back_Color
If Me.Enabled Then
bb = New SolidBrush(Me.BackColor)
visual_state = ComboBoxState.Normal
Else
bb = New SolidBrush(Me._disabled_back_color)
visual_state = ComboBoxState.Disabled
End If
'Filling the background
g.FillRectangle(bb, 0, 0, ClientRectangle.Width, ClientRectangle.Height)
'Drawing the datetime text
g.DrawString(Me.Text, Me.Font, New SolidBrush(TextColor), 5, 2)
'Drawing icon
If Not _image Is Nothing Then
Dim im_rect As New Rectangle(ClientRectangle.Width - 40, 4, ClientRectangle.Height - 8, ClientRectangle.Height - 8)
g.DrawImage(_image, im_rect)
End If
'Drawing the dropdownbutton using ComboBoxRenderer
ComboBoxRenderer.DrawDropDownButton(g, ddb_rect, visual_state)
g.Dispose()
bb.Dispose()
End Sub
End Class
*请注意,此类已简化,因此功能有限