动态创建C＃类或对象 [英] Dynamically Create C# Class or Object

问题描述

我具有这种结构。

public class FirstClass
{
   public List<Foo> FooList{ get; set; }
}

public class Foo{
   //Ex:
   //public string Name{ get; set; }  
}

public List<Foo> GetFoo(){
//I'm use Firstclass like this here typeof(FirstClass);
//I want create here dynamic property for Foo class.
}

我的问题是，我想从 GetFoo（）函数。同时，此函数返回列表 Foo类型。我正在研究在运行时动态添加C＃属性 ，< a href = https://stackoverflow.com/questions/3862226/how-to-dynamically-create-a-class-in-c>如何在C＃中动态创建类？ 这些链接中的答案未引用为返回值或未引用到另一个类。我该怎么办？

And my problem is, i want create property for "Foo" class from "GetFoo()" function. Same time, this function return "List" "Foo" type. I'm research "Dynamically Add C# Properties at Runtime", "How to dynamically create a class in C#?" but the answers in these links are not referenced as return values or referenced to another class. How i can do this?

推荐答案

您可以动态创建继承了 Foo ，以及任何其他属性。因此，您可以将这些动态类的实例添加到 List< Foo> 中。

You can dynamically create classes, which inherits Foo, with any additional properties. Thus you can add instances of those dynamic classes into List<Foo>.

为此，可以生成如下所示的代码字符串：

To do so, one can generate a code string like following:

var bar1Code = @"
public class Bar1 : Foo
{
    public Bar1(int value)
    {
        NewProperty = value;
    }
    public int NewProperty {get; set; }
}
";

然后使用 CSharpCodeProvider 进行编译：

var compilerResults = new CSharpCodeProvider()
    .CompileAssemblyFromSource(
        new CompilerParameters
        {
            GenerateInMemory = true,
            ReferencedAssemblies =
            {
                "System.dll",
                Assembly.GetExecutingAssembly().Location
            }
        },
        bar1Code);

然后可以创建 Bar1 的实例，将其添加到 List< Foo> 中，例如将其强制转换为动态以访问动态属性：

Then one can create an instance of Bar1, add it to List<Foo> and, e.g. cast it to dynamic to access the dynamic property:

var bar1Type = compilerResults.CompiledAssembly.GetType("Bar1");
var bar2Type = compilerResults.CompiledAssembly.GetType("Bar2"); // By analogy

var firstClass = new FirstClass
{
    FooList = new List<Foo>
    {
        (Foo)Activator.CreateInstance(bar1Type, 56),
        (Foo)Activator.CreateInstance(bar2Type, ...)
    }
};

var dynamicFoo = (dynamic)firstClass.FooList[0];
int i = dynamicFoo.NewProperty; // should be 56

这篇关于动态创建C＃类或对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！