话不多说，直接贴代码
一下代码根据自己需求进行修改，总的来说就是重写视图路径
net mvc： /// <summary>
/// 主题路径提供者视图引擎
/// </summary>
public abstract class ThemeVirtualPathProviderViewEngine : VirtualPathProviderViewEngine
{
//工作上下文
private static IThemeContext themeContext;
//模板视图位置格式
private readonly string[] _templateslocationformats = new string[] {
"~/{0}/{1}/Views/{2}.cshtml",
"~/{0}/{1}/Views/Shared/{2}.cshtml",
"~/Views/Shared/{2}.cshtml"
};
//模板视图位置格式
private readonly string[] _arealocationformats = new string[] {
//themes
"~/Areas/{2}/Themes/{1}/Views/{0}.cshtml",
"~/Areas/{2}/Themes/{1}/Views/Shared/{0}.cshtml",
//default
"~/Areas/{2}/Views/{1}/{0}.cshtml",
"~/Areas/{2}/Views/Shared/{0}.cshtml",
};
protected ThemeVirtualPathProviderViewEngine()
{
//将视图文件扩展名限制为cshtml
FileExtensions = new[] { "cshtml" };
}
#region 重写方法
/// <summary>
/// 使用指定的控制器上下文和母版视图名称来查找指定的视图
/// </summary>
/// <param name="controllerContext">控制器上下文</param>
/// <param name="viewName">视图的名称</param>
/// <param name="masterName">母版视图的名称</param>
/// <param name="useCache">若为 true，则使用缓存的视图</param>
/// <returns>页视图</returns>
public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache)
{
//构建一个视图引擎结果
ViewEngineResult result = FindThemeView(controllerContext, viewName, masterName, useCache);
return result;
}
/// <summary>
/// 寻找分部视图的方法
/// </summary>
/// <param name="controllerContext">控制器上下文</param>
/// <param name="partialViewName">分部视图的名称</param>
/// <param name="useCache">若为 true，则使用缓存的分部视图</param>
/// <returns>分部视图</returns>
public override ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName, bool useCache)
{
//构建一个分部视图引擎结果
ViewEngineResult result = FindThemePartialView(controllerContext, partialViewName, useCache);
return result;
}
#endregion
protected virtual string GetCurrentTheme(bool mobile)
{
themeContext = ThemeContext.GetInstance();
if (mobile)
return themeContext.WorkingMobileTheme;
else
return themeContext.WorkingDesktopTheme;
}
#region 工具方法
/// <summary>
/// 获取文件的路径
/// </summary>
private string GetPath(ControllerContext controllerContext, string name, string controllerName, string theme, string cacheKeyPrefix, bool useCache, out string[] searchedLocations)
{
searchedLocations = null;
//视图位置列表
string[] locations = null;
//获取区域
string area = GetRouteDataTokenValue("area", controllerContext.RouteData.DataTokens).ToLower();
if (area.Length == 0)//前台视图位置的处理
{
locations = _templateslocationformats;
}
else
{
locations = _arealocationformats;
}
//是否为特殊路径的标识
bool flag2 = IsSpecificName(name);
//从缓存中获取视图位置
string cacheKey = CreateCacheKey(cacheKeyPrefix, name, flag2 ? string.Empty : controllerName, area, theme);//视图位置的缓存键
if (useCache)
{
//从缓存中得到视图位置
var cachedPath = ViewLocationCache.GetViewLocation(controllerContext.HttpContext, cacheKey);
if (cachedPath != null)
{
return cachedPath;
}
}
//如果视图位置不在缓存中，则构建视图位置并存储到缓存中
if (!flag2)//不是特殊路径时的操作
{
return GetPathFromGeneralName(controllerContext, locations, name, theme, controllerName, area, cacheKey, ref searchedLocations);
}
else//特殊路径时的操作
{
return GetPathFromSpecificName(controllerContext, name, cacheKey, ref searchedLocations);
}
}
/// <summary>
/// 特殊名称时构建视图路径
/// </summary>
private string GetPathFromSpecificName(ControllerContext controllerContext, string name, string cacheKey, ref string[] searchedLocations)
{
//将路径添加到视图位置缓存
ViewLocationCache.InsertViewLocation(controllerContext.HttpContext, cacheKey, name);
//扩展名不为“.cshtml”或者文件不存在时
if (!IsSupportedExtension(name) || !FileExists(controllerContext, name))
{
searchedLocations = new string[] { name };
return string.Empty;
}
return name;
}
/// <summary>
/// 普通名称时构建视图路径
/// </summary>
private string GetPathFromGeneralName(ControllerContext controllerContext, string[] viewLocationFormats, string name, string theme, string controllerName, string areaName, string cacheKey, ref string[] searchedLocations)
{
int count = viewLocationFormats.Length;
searchedLocations = new string[count];
//循环视图位置
for (int i = 0; i < count; i++)
{
string path = string.Empty;
if (!string.IsNullOrEmpty(areaName))//后台访问
{
path = string.Format(viewLocationFormats[i], name, controllerName, areaName);
}
else
{
path = string.Format(viewLocationFormats[i], DTKeys.DIRECTORY_REWRITE_MVC, theme, name);
}
if (FileExists(controllerContext, path))
{
searchedLocations = null;
ViewLocationCache.InsertViewLocation(controllerContext.HttpContext, cacheKey, path);
return path;
}
//将路径添加到搜索位置列表中
searchedLocations[i] = path;
}
return string.Empty;
}
/// <summary>
/// 创建视图位置的缓存键
/// </summary>
private string CreateCacheKey(string prefix, string name, string controllerName, string area, string theme)
{
return string.Format(":ViewCacheKey:{0}:{1}:{2}:{3}:{4}:{5}", new object[] { base.GetType().AssemblyQualifiedName, prefix, name, controllerName, area, theme });
}
/// <summary>
/// 构建视图引擎结果
/// </summary>
private ViewEngineResult FindThemeView(ControllerContext controllerContext, string viewName, string masterName, bool useCache)
{
//视图文件路径搜索列表
string[] strArray1 = null;
//布局文件路径搜索列表
string[] strArray2 = null;
//获取控制器名称
string controllerName = controllerContext.RouteData.GetRequiredString("controller");
//获取视图文件路径
string viewPath = GetPath(controllerContext, viewName, controllerName, GetCurrentTheme(false), "View", useCache, out strArray1);
//当视图文件存在时
if (!string.IsNullOrWhiteSpace(viewPath))
{
if (string.IsNullOrWhiteSpace(masterName))
{
return new ViewEngineResult(CreateView(controllerContext, viewPath, string.Empty), this);
}
else
{
//获取布局文件的路径
string masterPath = GetPath(controllerContext, masterName, controllerName, GetCurrentTheme(false), "Master", useCache, out strArray2);
if (!string.IsNullOrWhiteSpace(masterPath))
{
return new ViewEngineResult(CreateView(controllerContext, viewPath, masterPath), this);
}
}
}
//当视图文件或布局文件不存在时将搜索路径返回
if (strArray2 == null)
{
return new ViewEngineResult(strArray1);
}
else
{
return new ViewEngineResult(strArray1.Union<string>(strArray2));
}
}
/// <summary>
/// 构建分部视图引擎结果
/// </summary>
private ViewEngineResult FindThemePartialView(ControllerContext controllerContext, string partialViewName, bool useCache)
{
//分部视图文件路径搜索列表
string[] strArray;
//获取控制器名称
string controllerName = controllerContext.RouteData.GetRequiredString("controller");
//获取分部视图文件路径
string partialViewPath = GetPath(controllerContext, partialViewName, controllerName, GetCurrentTheme(false), "Partial", useCache, out strArray);
//当分部视图文件存在时
if (!string.IsNullOrWhiteSpace(partialViewPath))
{
return new ViewEngineResult(CreatePartialView(controllerContext, partialViewPath), this);
}
//分部视图文件不存在时返回搜索路径
return new ViewEngineResult(strArray);
}
/// <summary>
/// 判读视图名称是否以“~”或“/”开头
/// </summary>
private bool IsSpecificName(string name)
{
char ch = name[0];
if (ch != '~')
{
return (ch == '/');
}
return true;
}
/// <summary>
/// 判读文件扩展名是否为“.cshtml”
/// </summary>
private bool IsSupportedExtension(string path)
{
return path.EndsWith(".cshtml", StringComparison.OrdinalIgnoreCase);
}
/// <summary>
/// 获取路由集合中指定键的值
/// </summary>
private string GetRouteDataTokenValue(string key, RouteValueDictionary dict)
{
object value = dict[key];
if (value == null)
return string.Empty;
return value.ToString();
}
#endregion
}
net core：
/// <summary>
/// 指定Microsoft使用的视图位置扩展器的约定。Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine实例来确定视图的搜索路径
/// </summary>
public class ThemeableViewLocationExpander : IViewLocationExpander
{
private const string THEME_KEY = "dtcms.themename";
/// <summary>
/// 工作上下文
/// </summary>
private static IThemeContext themeContext;
protected virtual string GetCurrentTheme(bool mobile)
{
themeContext = ThemeContext.GetInstance();
if (mobile)
{
return themeContext.WorkingMobileTheme;
}
else
{
return themeContext.WorkingDesktopTheme;
}
}
/// <summary>
/// Invoked by a Microsoft.AspNetCore.Mvc.Razor.RazorViewEngine to determine the
/// 此实例将使用的值 Microsoft.AspNetCore.Mvc.Razor.IViewLocationExpander
/// 计算出的值用于确定视图位置自上次定位以来是否发生了更改
/// </summary>
/// <param name="context"></param>
public void PopulateValues(ViewLocationExpanderContext context)
{
//根本不需要添加可主题化的视图位置，因为管理层无论如何都不应该是可主题化的
if (context.AreaName != null)
{
if (context.AreaName.ToLower()?.Equals("admin") ?? false)
{
return;
}
}
context.Values[THEME_KEY] = GetCurrentTheme(false);
}
/// <summary>
/// 用于确定视图的潜在位置
/// </summary>
/// <param name="context">Context</param>
/// <param name="viewLocations">视图位置</param>
/// <returns></returns>
public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
{
if (context.Values.TryGetValue(THEME_KEY, out string theme))
{
viewLocations = new[] {
$"/templates/{theme}/Views/0.cshtml",
$"/templates/{theme}/Views/Shared/0.cshtml",
}
.Concat(viewLocations);
}
return viewLocations;
}
}net core需要注意的是，还要要注册服务：
//添加主题模板
services.Configure<RazorViewEngineOptions>(options =>
{
options.ViewLocationExpanders.Add(new ThemeableViewLocationExpander());
});
