在 C# 中将匿名对象作为参数传递
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Passing an anonymous object as an argument in C#
提问by user1091156
I have a problem with passing an anonymous object as an argument in a method. I want to pass the object like in JavaScript. Example:
我在将匿名对象作为方法中的参数传递时遇到问题。我想像在 JavaScript 中一样传递对象。例子：
function Test(obj) {
return obj.txt;
}
console.log(Test({ txt: "test"}));
But in C#, it throws many exceptions:
但是在 C# 中，它会抛出很多异常：
class Test
{
public static string TestMethod(IEnumerable<dynamic> obj)
{
return obj.txt;
}
}
Console.WriteLine(Test.TestMethod(new { txt = "test" }));
Exceptions:
例外：
- Argument 1: cannot convert from 'AnonymousType#1' to 'System.Collections.Generic.IEnumerable'
- The best overloaded method match for 'ConsoleApplication1.Test.TestMethod(System.Collections.Generic.IEnumerable)' has some invalid arguments
- 'System.Collections.Generic.IEnumerable' does not contain a definition for 'txt' and no extension method 'txt' accepting a first argument of type 'System.Collections.Generic.IEnumerable' could be found (are you missing a using directive or an assembly reference?)
- 参数 1：无法从“AnonymousType#1”转换为“System.Collections.Generic.IEnumerable”
- “ConsoleApplication1.Test.TestMethod(System.Collections.Generic.IEnumerable)”的最佳重载方法匹配有一些无效参数
- “System.Collections.Generic.IEnumerable”不包含“txt”的定义，并且找不到接受“System.Collections.Generic.IEnumerable”类型的第一个参数的扩展方法“txt”（您是否缺少 using 指令或汇编参考？）
采纳答案by Servy
It looks like you want:
看起来你想要：
class Test
{
public static string TestMethod(dynamic obj)
{
return obj.txt;
}
}
You're using it as if it's a single value, not a sequence. Do you really want a sequence?
你使用它就好像它是一个单一的值，而不是一个序列。你真的想要一个序列吗？
回答by Rookian
This works fine :)
这工作正常:)
public class Program
{
private static void Main(string[] args)
{
Console.WriteLine(Test.TestMethod(new[] {new {txt = "test"}}));
Console.ReadLine();
}
}
public class Test
{
public static string TestMethod(IEnumerable<dynamic> obj)
{
return obj.Select(o => o.txt).FirstOrDefault();
}
}
回答by GrayFox374
This should do it...
这个应该可以...
class Program
{
static void Main(string[] args)
{
var test = new { Text = "test", Slab = "slab"};
Console.WriteLine(test.Text); //outputs test
Console.WriteLine(TestMethod(test)); //outputs test
}
static string TestMethod(dynamic obj)
{
return obj.Text;
}
}
