调用在运行时确定的类型参数的通用函数 [英] Calling a generic function with a type parameter determined at runtime

问题描述

具体而言，代码如下所示：

  
 FieldInfo [] dataFields = this.GetType（）。GetFields（BindingFlags.Public | BindingFlags.Instance）; 
 
 //数据只是DataStream内部使用的一个字节数组
 DataStream ds = new DataStream（data）; 
 
 foreach（dataFields中的FieldInfo字段）
 {
类型fieldType = field.FieldType; 
 
 //我想调用此方法并传入由字段类型指定的类型参数
 object objData =（object）ds.Read< fieldType>（）; 
} 
  

Read（）函数如下所示：

  
 public T Read（）其中T：struct 
  

此函数的目的是返回从字节数组读取的数据。

有没有办法在运行时像这样调用泛型方法？

解决方案

最简单的方法是使用单个Type参数对Read函数进行非泛型重载：

  public object Read（type t）
  

然后通用版本调用非泛型版本：

  public T阅读< T>（）其中T：struct 
 {
 return（T）Read（typeof（T））
} 
  

I have a question involving calling a class's generic method with a type parameter that is known at runtime.

In specific, the code looks like so:

FieldInfo[] dataFields = this.GetType().GetFields( BindingFlags.Public | BindingFlags.Instance );

// data is just a byte array used internally in DataStream
DataStream ds = new DataStream( data );

foreach ( FieldInfo field in dataFields )
{
    Type fieldType = field.FieldType;

    // I want to call this method and pass in the type parameter specified by the field's type
    object objData = ( object ) ds.Read<fieldType>();
}

The Read() function looks like so:

public T Read() where T : struct

This function's purpose is to return data read from a byte array.

Is there any way to call a generic method at runtime like this?

解决方案

The easiest way to handle this would be to make a non-generic overload of the Read function with a single Type parameter:

public object Read(Type t)

And then have the generic version call the non-generic version:

public T Read<T>() where T : struct
{
    return (T)Read(typeof(T))
}

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