2.如果Dictionary中已经有了key, 则再Add会报错: Dictionary 中已存在具有相同键的元素。 而Dictionary[key]则不会报错,没有时添加,有时则修改替换,因此,更加推荐使用Dictionary[key]=value这个方法,更安全,不必写个if判断。
You can use the IDictionary<TKey,TValue> interface which provides the Add(KeyValuePair<TKey,TValue>) method: IDictionary<int, string> dictionary = new Dictionary<int, string>(); dictionary.Add(new KeyValuePair<int,string>(0,"0")); dictionary.Add(new KeyValuePair<int,string>(1,"1"))...
初始化 AddToDictionary<TKey, TValue> 类的新实例。 属性 展开表 名称说明 CacheId (从 Activity 继承。) Dictionary 获取或设置目标字典。 DisplayName (从 Activity 继承。) Id (从 Activity 继承。) ImplementationVersion (从 CodeActivity 继承。) Key 获取或设置要添加的键。 Value 获取或设置...
Dictionary.Add方法会在向字典中添加键值对时检查键是否已经存在,如果键已经存在,会抛出一个异常(ArgumentException)。而Dictionary[key]=value则会直接覆盖已经存在的键的值,或者在键不存在时添加一个新的键值对。 Dictionary.Add方法返回void,没有返回值。而Dictionary[key]=value的赋值操作会返回指定的值,可以将其赋...
I'm trying to add keys and values to a dictionary by using strings instead of quoted text. So instead of this, dict['key'] = value this: dict[key] = value When I run the command above, I get this error: TypeError: 'str' object does not support item assignment I think ...
In the above code, we first initialize a dictionary and then add a newkey-valuepair to the dictionary usingdictionary[key]. If thekeydoes not exist, then this newkey-valuepair is added to the dictionary. If thekeyalready exists, then the value of the existingkeyis updated to the newvalu...
my_dictionary[new_key] = new_value This key-value pair will be added to the dictionary. If you're using Python 3.6 or later, it will be added as the last item of the dictionary. Let's make a dictionary, and then add a new key-value pair with this approach: ...
First of all, we have created a dictDat dictionary object and stored two elements. Then, we have used the print() to display the dictionary values. Next, we have used the update() method to add another key along with the value within the previouslyexisting dictionary. Finally, we have us...
[Ok := ]Dictionary.Add(Key: TKey,Value: TValue) Parameters Dictionary Type:Dictionary An instance of theDictionarydata type. Key Type:TKey The key of the element to add. Value Type:TValue The value of the element to add. ...
IImmutableDictionary<TKey,TValue>.Add(TKey, TValue) 方法 参考 反馈 本文内容 定义 注解 适用于 定义 命名空间: System.Collections.Immutable 程序集: System.Collections.Immutable.dll 将具有指定键和值的元素添加到字典。 C# 复制 public System.Collections.Immutable.IImmutableDictionary<TKey,T...