在C#中怎么修改progressBar的颜色

1、在属性窗口设置progressBar的BackColor属性可以修改背景色，也可以用代码，如：

progressBar.BackColor=System.Drawing.Blue

2、在属性窗口设置progressBar的ForeColor属性可以修改前景色，也可以用代码，如：

progressBar.ForeColor=System.Drawing.Red

给你举个例子,是改进度条颜色滴,自己延伸下吧~

Option Explicit

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _

(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _

lParam As Any) As Long

Private Const WM_USER = &H400

Private Const PBM_SETBARCOLOR = (WM_USER + 9)

Private Function SetProgressBarColor(TargetProgressBar As ProgressBar) '进度条的颜色

SendMessage TargetProgressBar.hwnd, PBM_SETBARCOLOR, 0, ByVal RGB(IIf(TargetProgressBar.Value / TargetProgressBar.Max * 255 <255 * 0.5, TargetProgressBar.Value / TargetProgressBar.Max * 255 * 2, 255), IIf(TargetProgressBar.Value / TargetProgressBar.Max * 255 <255 * 0.5, 255, (255 - TargetProgressBar.Value / TargetProgressBar.Max * 255) * 2), 0)

End Function

Private Sub Command1_Click()

If ProgressBar1.Value <ProgressBar1.Max Then

ProgressBar1.Value = ProgressBar1.Value + 10

Else

ProgressBar1.Value = 0

End If

SetProgressBarColor ProgressBar1

End Sub

Private Sub Form_Load()

ProgressBar1.Max = 100

ProgressBar1.Value = 0

End Sub

'自己添加控件试下吧

需求：下载中的颜色要自定义，要替换为另外的一个颜色

方法：就是在

<ProgressBar

android:layout_weight="1"

android:id="@+id/download_item_progressBar"

style="?android:attr/progressBarStyleHorizontal"

android:layout_width="wrap_content"

android:layout_height="15dip"

android:progressDrawable="@drawable/progressbar_style"></ProgressBar>

在drawable中新建一个progressBar_style.xml文件，

这个属性进行设置，有两个方案：

第一，设置两张图片：

<?xml version="1.0" encoding="utf-8"?>

<layer-list xmlns:android="">

<item android:id="@android:id/background"

android:drawable="@drawable/progressbar_not" />

<item android:id="@android:id/secondaryProgress"

android:drawable="@drawable/progressbar_not">

</item>

<item android:id="@android:id/progress"

android:drawable="@drawable/progressbar_selected">

</item>

</layer-list>

第二种，设置背景颜色：

<?xml version="1.0" encoding="utf-8"?>

<item android:id="@android:id/background"

>

<shape>

<corners android:radius="5dip" />

<gradient

android:startColor="#666666"

android:centerColor="#666666"

android:centerY="0.75"

android:endColor="#666666"

android:angle="270"

/>

</shape>

</item>

<item android:id="@android:id/progress"

>

<clip>

<shape>

<corners android:radius="5dip" />

<gradient

android:startColor="#da1f3e"

android:centerColor="#da1f3e"

android:centerY="0.75"

android:endColor="#da1f3e"

android:angle="270"

/>

</shape>

</clip>

</item>

<item android:id="@android:id/secondaryProgress"

>

<clip>

<shape>

<corners android:radius="5dip" />

<gradient

android:startColor="#fed7ec"

android:centerColor="#fed7ec"

android:centerY="0.75"

android:endColor="#fed7ec"

android:angle="270"

/>

</shape>

</clip>

</item>

</layer-list>

其中的属性还要进一步研究具体作用，据文档翻译有设置角度，渐变的。

转载，仅供参考。

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