如何使用泛型调用水晶报表 [英] How to call a crystal report using Generics

问题描述

你好，

请查看以下方法:

Hello,

please look at the following method:

public static bool BindReport<t>(CrystalReportViewer viewer, DataTable dt, List<string> paramNames, List<string> paramValues) where T : class, new()
       {
           try
           {
               SetParameters(paramNames, paramValues, viewer);
               T rpt = new T();
               rpt.SetDataSource(dt);   /*actually no "SetDataSource" method found; but i need that*/
               viewer.ReportSource = rpt;
           }
           catch (exception ex)
           {
               throw ex;
           }
           return true;
       }

我需要对

I need to do something with

where T : class, new()

请建议我.

Please suggest me.

推荐答案

我需要做点什么"是什么意思?

此

What do you mean with "I need to do something with"?

This

where T : class, new()

表示T类型必须是一个类并具有构造函数.看看类型参数的约束(C#编程指南) [

means that the T type must be a class and have a constructor. Have a look at Constraints on Type Parameters (C# Programming Guide)[^] for a more detailed description.

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