ASP.NET Core MVC通過IViewLocationExpander擴充套件檢視搜尋路徑
阿新 • • 發佈：2020-04-05
**IViewLocationExpander API**
- ExpandViewLocations Razor檢視路徑，檢視引擎會搜尋該路徑.
- PopulateValues 每次呼叫都會填充路由
專案目錄如下所示
建立區域擴充套件器，其實我並不需要多區域，我目前只需要達到一個區域中有多個資料夾進行存放我的檢視.
所以我通過實現**IViewLocationExpander**進行擴充套件新增我自定義檢視路徑規則即可正如下程式碼片段
```csharp
public class MyViewLocationExpander : IViewLocationExpander
{
public IEnumerable ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable viewLocations)
{
if (context.ControllerName != null && context.ControllerName.StartsWith("App"))
{
viewLocations = viewLocations.Concat(
new[] { $"/Areas/sysManage/Views/App/{context.ControllerName}/{context.ViewName}{RazorViewEngine.ViewExtension}"
});
return viewLocations;
}
if (context.AreaName != "sysManage") return viewLocations;
viewLocations = viewLocations.Concat(
new[] { $"/Areas/sysManage/Views/System/{context.ControllerName}/{context.ViewName}{RazorViewEngine.ViewExtension}"
});
return viewLocations;
}
public void PopulateValues(ViewLocationExpanderContext context)
{
}
}
```
在Startup.ConfigureServices 註冊
```csharp
public void ConfigureServices(IServiceCollection services)
{
services.Configure(o => {
o.ViewLocationExpanders.Add(new MyViewLocationExpander());
});
services.AddMvc();
}
```
```csharp
app.UseEndpoints(endpoints =>
{
endpoints.MapRazorPages();
endpoints.MapAreaControllerRoute(
name: "sysManage", "sysManage",
pattern: "{area:exists}/{controller=Home}/{action=Index}/{id?}");
});
```
最終路由指向的還是
```
/SysManage/Controller/Ac