Dictionary.Add与Dictionary [key] = value的差异 [英] Difference of Dictionary.Add vs Dictionary[key]=value

问题描述

Dictionary.Add 方法和索引器 Dictionary [key] =值有什么区别?

What is the difference between the Dictionary.Add method and the indexer Dictionary[key] = value?

推荐答案

添加->如果字典中已存在该项，则将其添加到字典中.

Add -> Adds an item to the dictionary if item already exists in the dictionary an exception will be thrown.

索引器或字典[密钥] => 添加或更新.如果字典中不存在该键，则将添加一个新项.如果键存在，则将使用新值更新该值.

Indexer or Dictionary[Key] => Add Or Update. If the key doesn't exist in the dictionary, a new item will be added. If the key exists then the value will be updated with the new value.

dictionary.add 将向字典中添加一个新项目， dictionary [key] = value 将针对键为字典中的现有条目设置一个值.如果键不存在，则它(indexer)将该项添加到字典中.

dictionary.add will add a new item to the dictionary, dictionary[key]=value will set a value to an existing entry in the dictionary against a key. If the key is not present then it (indexer) will add the item in the dictionary.

Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("Test", "Value1");
dict["OtherKey"] = "Value2"; //Adds a new element in dictionary 
Console.Write(dict["OtherKey"]);
dict["OtherKey"] = "New Value"; // Modify the value of existing element to new value
Console.Write(dict["OtherKey"]);

在上面的示例中，第一位 dict ["OtherKey"] ="Value2"; 将在字典中添加新值，因为它不存在，而第二位将将该值修改为新值".

In the above example, in first place dict["OtherKey"] = "Value2"; will add a new value in the dictionary because it doesn't exist, and in second place it will modify the value to New Value.

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