Hashtable | Dictionary |
---|---|
A Hashtable is a non-generic collection. | A Dictionary is a generic collection. |
Hashtable is defined under System.Collections namespace. | Dictionary is defined under System.Collections.Generic namespace. |
In Hashtable, you can store key/value pairs of the same type or of the different type. | In Dictionary, you can store key/value pairs of same type. |
In Hashtable, there is no need to specify the type of the key and value. | In Dictionary, you must specify the type of key and value. |
The data retrieval is slower than Dictionary due to boxing/ unboxing. | The data retrieval is faster than Hashtable due to no boxing/ unboxing. |
In Hashtable, if you try to access a key that doesn’t present in the given Hashtable, then it will give null values. | In Dictionary, if you try to access a key that doesn’t present in the given Dictionary, then it will give error. |
It is thread safe. | It is also thread safe but only for public static members. |
It doesn’t maintain the order of stored values. | It always maintain the order of stored values. |
C# 中 字典(Dictionary)和哈希表(Hashtable)的区别
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转载自blog.csdn.net/qq_37454669/article/details/121991462
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