如何在c#项目中实现一个winform主题？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
1、一个接口，需要做主题的控件、窗体都要实现这个接口
/// <summary>
/// 使用主题的控件、窗体需要实现此接口
/// </summary>
public interface IThemeControl
{
ITheme ThisTheme { get; set; }
/// <summary>
/// 重置主题
/// </summary>
void ResetTheme();
}/// <summary>
/// 主题
/// </summary>
public interface ITheme
{
int Code { get; }
/// <summary>
/// 初始化
/// </summary>
void Init();
}/// <summary>
/// 主题设置
/// </summary>
public class Theme
{
internal delegate void CheckedThemeEventHandle(ITheme theme);
/// <summary>
/// 改变主题事件
/// </summary>
static internal event CheckedThemeEventHandle CheckedThemeEvent;
static ITheme currentTheme;
/// <summary>
/// 当前主题
/// </summary>
internal static ITheme CurrentTheme
{
get { return currentTheme; }
set
{
if (value == null)
return;
currentTheme = value;
currentTheme.Init();
if (CheckedThemeEvent != null)
{
CheckedThemeEvent(value);
}
}
}
/// <summary>
/// 加载控件的主题
/// </summary>
/// <param name="control"></param>
internal static void LoadTheme(IThemeControl control)
{
control.ResetTheme();
}
}public interface IThemeBaseForm
{
/// <summary>
/// 基本窗体背景色
/// </summary>
Color BaseFormBackgroundColor { get; }
/// <summary>
/// 基本窗体文字颜色
/// </summary>
Color BaseFormForeColor { get; }
/// <summary>
/// 标题栏颜色
/// </summary>
Color BaseFormTitleColor { get; }
}窗体的样式接口（例子）
public interface IThemeFrmLock : IThemeBaseForm
{
Color FrmLock_TxtFillColor { get; }
Color FrmLock_TxtRectColor { get; }
Color FrmLock_TxtForeColor { get; }
Color FrmLock_btnFillColor { get; }
Color FrmLock_btnForeColor { get; }
Color FrmLock_btnRectColor { get; }
}控件的样式接口（例子）
public interface IThemeUCFileItem : ITheme
{
Color UCFileItem_BackgroundColor { get; }
Color UCFileItem_ForeColor { get; }
Color UCFileItem_BoxColor { get; }
Image UCFileItem_Img1 { get; }
Image UCFileItem_Img2 { get; }
Image UCFileItem_Img3 { get; }
Image UCFileItem_Img4 { get; }
Image UCFileItem_Img5 { get; }
}我这里做一个深色一个浅色主题
深色的
/// <summary>
/// 深色
/// </summary>
public partial class Dark :
ITheme,
IThemeBaseForm,
IThemeFrmLock,
IThemeUCFileItem
{
public int Code { get { return 1; } }
/// <summary>
/// 基本窗体背景色
/// </summary>
public Color BaseFormBackgroundColor { get { return Color.FromArgb(37, 41, 59); } }
/// <summary>
/// 基本窗体文字颜色
/// </summary>
public Color BaseFormForeColor { get { return Color.White; } }
public Color BaseFormTitleColor { get { return Color.FromArgb(38, 45, 67); } }
/// <summary>
/// 初始化操作
/// </summary>
public void Init()
{
//这里做一些修改主题时候的业务
}
#region 重写运算符
/// <summary>
/// 重写==
/// </summary>
/// <param name="lhs"></param>
/// <param name="rhs"></param>
/// <returns></returns>
public static bool operator ==(Dark lhs, ITheme rhs)
{
if (lhs == null && rhs == null)
return true;
else
{
if (lhs != null && rhs != null)
{
if (lhs.Code == rhs.Code)
return true;
else
return false;
}
else
return false;
}
}
/// <summary>
/// 重写!=
/// </summary>
/// <param name="lhs"></param>
/// <param name="rhs"></param>
/// <returns></returns>
public static bool operator !=(Dark lhs, ITheme rhs)
{
if (lhs == null && rhs == null)
return false;
else
{
if (lhs != null && rhs != null)
{
if (lhs.Code == rhs.Code)
return false;
else
return true;
}
else
return true;
}
}
public override bool Equals(object obj)
{
if (obj == null || GetType() != obj.GetType())
{
return false;
}
if (obj is ITheme)
{
if (Code == ((ITheme)obj).Code)
return true;
else
return false;
}
else
{
return false;
}
}
public override int GetHashCode()
{
return base.GetHashCode();
}
#endregion
}浅色的也一样 只需要实现
ITheme,
IThemeBaseForm,
IThemeFrmLock,
IThemeUCFileItem
这些接口就行（定义的控件接口，这里都要进行实现）
然后添加具体的控件主题实现类
/// <summary>
/// FrmLock
/// </summary>
public partial class Dark
{
public Color FrmLock_TxtFillColor { get { return Color.FromArgb(34, 40, 60); } }
public Color FrmLock_TxtRectColor { get { return Color.FromArgb(65, 75, 101); } }
public Color FrmLock_TxtForeColor { get { return Color.White; } }
public Color FrmLock_btnFillColor { get { return Color.FromArgb(46, 54, 76); } }
public Color FrmLock_btnForeColor { get { return Color.FromArgb(175, 193, 225); } }
public Color FrmLock_btnRectColor { get { return Color.FromArgb(65, 75, 101); } }
}然后就是去控件或窗体里面做事情了，实现接口Theme.IThemeControl，构造函数里面添加CheckedThemeEvent事件
public partial class FrmLock : FrmWithTitle,Theme.IThemeControl
{
public FrmLock()
{
try
{
InitializeComponent();
Theme.Theme.CheckedThemeEvent += Theme_CheckedThemeEvent;
}
catch (Exception ex)
{
}
}
void Theme_CheckedThemeEvent(Theme.ITheme theme)
{
if (this.Visible)
{
ThisTheme = theme;
}
}VisibleChanged事件添加内容
private void FrmLock_VisibleChanged(object sender, EventArgs e)
{
if (Visible)
{
ThisTheme = Theme.Theme.CurrentTheme;
}
}实现的接口
Theme.ITheme thisTheme = null;
/// <summary>
/// 当前页面正在使用的主题
/// </summary>
public Theme.ITheme ThisTheme
{
get
{
if (thisTheme == null)
{
ThisTheme = Theme.Theme.CurrentTheme;
}
return thisTheme;
}
set
{
if (thisTheme != value)
{
thisTheme = value;
Theme.Theme.LoadTheme(this);
}
}
}
public void ResetTheme()
{
var t = (Theme.IThemeFrmLock)ThisTheme;
this.BackColor = t.BaseFormBackgroundColor;
this.lblTitle.BackColor = t.BaseFormTitleColor;
this.lblTitle.ForeColor = t.BaseFormForeColor;
ucControlBase1.FillColor = t.FrmLock_TxtFillColor;
ucControlBase1.RectColor = t.FrmLock_TxtRectColor;
txtPW.BackColor = t.FrmLock_TxtFillColor;
txtPW.ForeColor = t.FrmLock_TxtForeColor;
tongyong_btnPaiZhaoPath.FillColor = t.FrmLock_btnFillColor;
tongyong_btnPaiZhaoPath.RectColor = t.FrmLock_btnRectColor;
tongyong_btnPaiZhaoPath.ForeColor = t.FrmLock_btnForeColor;
}以上就是修改代码，下面看调用
Theme.Theme.CurrentTheme = new Theme.Dark();
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