声明Collection的正确方法是什么 <bool> 对象和不同的数据类型？

Question

What's the proper way to use Collection object & of different datatype?

I'm getting type or namespace Collection<bool> could not be found error. Also found that member variable _isFormData is both bool, int and string at once. :-/

Saw this example, under accepted answer, at Web API: how to access multipart form values when using MultipartMemoryStreamProvider?

private Collection<bool> _isFormData = new Collection<bool>();  //bool...

_isFormData.Add(String.IsNullOrEmpty(contentDisposition.FileName));  //string...

for (int index = 0; index < Contents.Count; index++)
{
   if (_isFormData[index]) //int...
   { }
}

Answer 1

You need to have a using System.Collections.ObjectModel; line for the type to referenced correctly in your class.

The type is only ever a collection of booleans:

String.IsNullOrEmpty(contentDisposition.FileName)

tests whether contentDisposition.FileName is null or "" and returns true if so; false otherwise.

isFormData[index]

returns the bool value in the collection at element index .

Answer 2

Here's an example to get you started. Note the "using System.Collections.ObjectModel"

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;

public class Program
{
   public static void Main (String[] args)
   {
       IList<Boolean> testCollection = new Collection<Boolean>();
       testCollection.Add(false);
       testCollection.Add(true);
       FillCollection(testCollection);

       for (int index = 0; index < testCollection.Count; index++)
       {
           if (testCollection[index])
           {
               Console.WriteLine("testCollection[{0}] is true", index);
           }
           else
           {
               Console.WriteLine("testCollection[{0}] is false", index);   
           }
       }
   }

   public static void FillCollection (IList<Boolean> collection)
   {
       Random random = new Random();
       for (int i = 0; i < 500; i++)
       {
           Boolean item = Convert.ToBoolean(random.Next(0, 2));
           collection.Add(item);
       }
   }
}