我想问下，怎么样删除和增加Dictionary中的 键值对

[makeppy]

RT 我想要个例子 谢谢指点啦O(∩_∩)O哈哈~

[长沙三毛]

            Dictionary<int, string> d = new Dictionary<int, string>();
            d.Add(1, "11");
            d.Add(2, "22");
            d.Remove(1);

[liwei920]

Dictionary<int, string> kk = new Dictionary<int, string>();

[feiyun0112]

// Create a new dictionary of strings, with string keys.
//
Dictionary<string, string> openWith =
new Dictionary<string, string>();

// Add some elements to the dictionary. There are no
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("doc", "word.exe");
openWith.Add("rtf", "wordpad.exe");

// The Add method throws an exception if the new key is
// already in the dictionary.
try
{
openWith.Add("txt", "winword.exe");
}
catch (ArgumentException)
{
Console.WriteLine("An element with Key = \"txt\" already exists.");
}



// Use the Remove method to remove a key/value pair.

Console.WriteLine("\nRemove(\"doc\")");
openWith.Remove("doc");

if (!openWith.ContainsKey("doc"))
{
Console.WriteLine("Key \"doc\" is not found.");
}



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[jiang_jiajia10]

Dictionary<string, string> openWith = 
    new Dictionary<string, string>();

openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");


try
{
    openWith.Add("txt", "winword.exe");
}
catch (ArgumentException)
{
    Console.WriteLine("An element with Key = \"txt\" already exists.");
}

删除

Console.WriteLine("\nRemove(\"doc\")");
openWith.Remove("doc");

if (!openWith.ContainsKey("doc"))
{
    Console.WriteLine("Key \"doc\" is not found.");
}

MSDN上的例子参照一下

[makeppy]

我还有个问题：在key不变的时候如何改变它的value值啊？

[jiang_jiajia10]

[Quote=引用 5 楼 makeppy 的回复:]
我还有个问题：在key不变的时候如何改变它的value值啊？
[/Quote]

 Dictionary<string, string> openWith = 
    new Dictionary<string, string>();
            int i=0; 

            if (openWith .Contains(i)) 
            { 
                openWith [i] = i; //修改key为i的Value 
            } 
            else 
            { 
                openWith .Add(i, 0); //添加key为i的记录 
            }

[jiang_jiajia10]

[Quote=引用 5 楼 makeppy 的回复:]
我还有个问题：在key不变的时候如何改变它的value值啊？
[/Quote]

 Dictionary<string, string> openWith = 
    new Dictionary<string, string>();
            int i=0; 

            if (openWith .Contains(i)) 
            { 
                openWith [i] = i; //修改key为i的Value 
            } 
            else 
            { 
                openWith .Add(i, 0); //添加key为i的记录 
            }

[zhyuanshan]

openWith.Remove("key");
openWith.Add("key","value");

[zhangyanyang]

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