Question

我有这段代码：

 namespace Zinc.Web.Extensions.DataModel.Training
 {
   public static class TrainingModuleProgressStateDataModelExtentions
   { 
      public static string GetHintText(String aString)
      {

         //must still make up astring here
         return aString;
       }
   }
 }

 namespace Zinc.DataModels.Training
 {
    public class TrainingModuleProgressStateDataModel
    {
      public IEnumerable<UserTrainingPointsDataModel> UserTrainingPoints { get; set; }
    }
  }

  public class UserTrainingPointsDataModel
  {
    public virtual int InteractionType { get; set; }
    public virtual int Points { get; set; }
    public virtual string Name { get; set; }
    public virtual string IncentiveTrainingModuleOptionName { get; set; }
  }

在我的存储库中，我添加到UserTrainingPoints：

 string RawPoints = row["RawPoints"].ToString();
 string[] rawPoints = RawPoints.Split(new char[] { '|' });
 List<UserTrainingPointsDataModel> points = new List<UserTrainingPointsDataModel>();

 foreach (var RawPoint in rawPoints)
 {
   string[] entry = RawPoint.Split(new char[] { ',' });
   var point = new UserTrainingPointsDataModel();
   point.Name = entry[0];
   point.Points = Convert.ToInt32(entry[1]);
   point.InteractionType = Convert.ToInt32(entry[2]);
   point.IncentiveTrainingModuleOptionName = entry[3];
   points.Add(point);  

 }
 trainingModuleProgressState.UserTrainingPoints = points;
 data.Add(trainingModuleProgressState);

在我的视图中，我需要调用扩展方法，该方法将使用UserTrainingPoints中的值来组成一个字符串，然后我将在工具提示中显示该字符串。

我的问题是我如何实现扩展方法，以便我可以在我的视图中调用它？

我的观看代码：

 <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Zinc.Models.Training.TrainingModuleProgressStateDataModelResults>" %>
 <%@ Import namespace="Zinc.Web.Extensions.DataModel.Training" %> //added this

  <% if (module.HasAssessment)
  { %>
     <div class="<%: moduleStateClass %>">&nbsp;</div>
     <div class="<%: moduleScoreClass %>"><%: module.ModuleScore %>%</div>
     <% Zinc.Web.Extensions.DataModel.Training.TrainingModuleProgressStateDataModelExtentions.GetHintText(module.UserTrainingPoints); %>  //still not correct here

Answer 1

由于UserTrainingPoints是IEnumerable<UserTrainingPointsDataModel>，我认为你的扩展方法签名应该是

public static string GetHintText(this IEnumerable<UserTrainingPointsDataModel> points)
{
    string aString;
    //must still make up astring here
    return aString;
}

然后你就可以这样称呼它

module.UserTrainingPoints.GetHintText();

Answer 2

访问扩展方法的方法与通常的方法相同。但是，您应该注意使用@using关键字引用添加扩展名的命名空间。

实现扩展方法

2 个答案: