"A namespace cannot directly contain members such as fields or methods" 文件：具有上下文的控制器

Question

<#@ template language="C#" HostSpecific="True" #>
<#
var Model = (MvcTextTemplateHost)Host;
var routePrefix = String.Empty;
if (!String.IsNullOrWhiteSpace(Model.AreaName)) {
routePrefix = "/" + Model.AreaName;
}
routePrefix += "/" + Model.ControllerRootName + "/";
#>
<#@ import namespace="System.Collections" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="System.Data.Objects" #>
<#@ import namespace="System.Linq" #>
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
<# if(MvcTextTemplateHost.NamespaceNeeded(Model.Namespace,         Model.ModelType.Namespace)) { #>
using <#= Model.ModelType.Namespace #>;
<# } #>
<# if(Model.ContextType.Namespace != Model.ModelType.Namespace &&   MvcTextTemplateHost.NamespaceNeeded(Model.Namespace,  Model.ContextType.Namespace)) { #>
using <#= Model.ContextType.Namespace #>;
<# } #>
namespace <#= Model.Namespace #>
{
<#
var modelName = Model.ModelType.Name;
var entitySetName = Model.EntitySetName;
var modelVariable = modelName.ToLower();
var entitySetVariable = entitySetName.ToLower();
var primaryKey = Model.PrimaryKeys[0];
var lambdaVar = modelVariable[0];
var isObjectContext =   typeof(ObjectContext).IsAssignableFrom(Model.ContextType);
#>
public class <#= Model.ControllerName #> : BootstrapBaseController
{
    private <#= Model.ContextType.Name #> db = new <#= Model.ContextType.Name #>();

    //
    // GET: <#= routePrefix #>

    public ActionResult Index()
    {
<#  var includeExpressions = "";
if(isObjectContext) {
    includeExpressions = String.Join("",  Model.RelatedProperties.Values.Select(property => String.Format(".Include(\" {0}\")", property.PropertyName)));
}
else {
    includeExpressions = String.Join("", Model.RelatedProperties.Values.Select(property => String.Format(".Include({0} =>  {0}.{1})", lambdaVar, property.PropertyName)));
}
#>
# if(!String.IsNullOrEmpty(includeExpressions)) { #>
        var <#= entitySetVariable #> = db.<#= entitySetName #><#=    includeExpressions #>;
        return View(<#= entitySetVariable #>.ToList());
<# } else { #>
        return View(db.<#= entitySetName #><#= includeExpressions   #>.ToList());
<# } #>
    }

    //
    // GET: <#= routePrefix #>Details/5

    public ActionResult Details(<#= primaryKey.ShortTypeName #> id)
    {
<# if(isObjectContext) { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName   #>.Single(<#= lambdaVar #> => <#= lambdaVar #>.<#= primaryKey.Name #> == id);
<# } else { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName  #>.Find(id);
<# } #>
        if (<#= modelVariable #> == null)
        {
            return HttpNotFound();
        }
        return View(<#= modelVariable #>);
    }

    //
    // GET: <#= routePrefix #>Create

    public ActionResult Create()
    {
<# foreach (var property in Model.RelatedProperties.Values) { #>
        ViewBag.<#= property.ForeignKeyPropertyName #> = new SelectList(db.  <#= property.EntitySetName #>, "<#= property.PrimaryKey #>", "<#=  property.DisplayPropertyName #>");
<# } #>
        return View(new <#= modelName #>());
    }

    //
    // POST: <#= routePrefix #>Create

    [HttpPost]
    public ActionResult Create(<#= modelName #> <#= modelVariable #>)
    {
        if (ModelState.IsValid)
        {
<# if(primaryKey.Type == typeof(Guid)) { #>
            <#= modelVariable #>.<#= primaryKey.Name #> = Guid.NewGuid();
<# } #>
<# if(isObjectContext) { #>
            db.<#= entitySetName #>.AddObject(<#= modelVariable #>);
<# } else { #>
            db.<#= entitySetName #>.Add(<#= modelVariable #>);
<# } #>
            db.SaveChanges();
            return RedirectToAction("Index");
        }

<# foreach (var property in Model.RelatedProperties.Values) { #>
        ViewBag.<#= property.ForeignKeyPropertyName #> = new SelectList(db.  <#= property.EntitySetName #>, "<#= property.PrimaryKey #>", "<#=  property.DisplayPropertyName #>", <#= modelVariable #>.<#=  property.ForeignKeyPropertyName #>);
<# } #>
        return View(<#= modelVariable #>);
    }

    //
    // GET: <#= routePrefix #>Edit/5

    public ActionResult Edit(<#= primaryKey.ShortTypeName #> id = <#=  primaryKey.DefaultValue #>)
    {
<# if(isObjectContext) { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName   #>.Single(<#= lambdaVar #> => <#= lambdaVar #>.<#= primaryKey.Name #> == id);
<# } else { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName  #>.Find(id);
<# } #>
        if (<#= modelVariable #> == null)
        {
            return HttpNotFound();
        }
<# foreach (var property in Model.RelatedProperties.Values) { #>
        ViewBag.<#= property.ForeignKeyPropertyName #> = new SelectList(db.   <#= property.EntitySetName #>, "<#= property.PrimaryKey #>", "<#=  property.DisplayPropertyName #>", <#= modelVariable #>.<#=  property.ForeignKeyPropertyName #>);
<# } #>
        return View("Create", <#= modelVariable #>);
    }

    //
    // POST: <#= routePrefix #>Edit/5

    [HttpPost]
    public ActionResult Edit(<#= modelName #> <#= modelVariable #>)
    {
        if (ModelState.IsValid)
        {
<# if(isObjectContext) { #>
            db.<#= entitySetName #>.Attach(<#= modelVariable #>);
            db.ObjectStateManager.ChangeObjectState(<#= modelVariable #>,  EntityState.Modified);
<# } else { #>
            db.Entry(<#= modelVariable #>).State = EntityState.Modified;
<# } #>
            db.SaveChanges();
            return RedirectToAction("Index");
        }
<# foreach (var property in Model.RelatedProperties.Values) { #>
        ViewBag.<#= property.ForeignKeyPropertyName #> = new SelectList(db.   <#= property.EntitySetName #>, "<#= property.PrimaryKey #>", "<#= property.DisplayPropertyName #>", <#= modelVariable #>.<#= property.ForeignKeyPropertyName #>);
<# } #>
        return View("Create", <#= modelVariable #>);
    }

    //
    // GET: <#= routePrefix #>Delete/5

    public ActionResult Delete(<#= primaryKey.ShortTypeName #> id)
    {
<# if(isObjectContext) { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName   #>.Single(<#= lambdaVar #> => <#= lambdaVar #>.<#= primaryKey.Name #> == id);
        db.<#= entitySetName #>.DeleteObject(<#= modelVariable #>);
<# } else { #>
        <#= modelName #> <#= modelVariable #> = db.<#= entitySetName #>.Find(id);
        db.<#= entitySetName #>.Remove(<#= modelVariable #>);
    <# } #>
            db.SaveChanges();
            return RedirectToAction("Index");
        }
            protected override void Dispose(bool disposing)
            {
               db.Dispose();
               base.Dispose(disposing);
            }
        }
    }

此代码是在我的 Task1 ASP.NET MVC 应用程序中的代码模板文件下自动生成的，但是每当我执行我的项目时，我都会在该内容的第 1 行和第 1 栏收到上述错误，请提供我的解决方案来解决这个错误。

Answer 1

您只需使用以下代码片段即可重现该问题。

<#@ template language="C#" HostSpecific="True" #>
<#
var Model = (MvcTextTemplateHost)Host;
#>

无法解析 MvcTextTemplateHost 类型，导致出现您看到的错误。有相当多的 Google results 具有潜在的解决方案，其中大部分涉及确保您的项目具有对一个或另一个版本的 Microsoft.VisualStudio.Web.Mvc.3.01.dll 的有效引用。

"A namespace cannot directly contain members such as fields or methods" 文件：具有上下文的控制器

"A namespace cannot directly contain members such as fields or methods" File: controller with context

c#

asp.net

asp.net-mvc-3

namespaces

runtime