C# 如何重置字典
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How to reset a Dictionary
提问by Nano HE
If I declared a dictionary like this:
如果我声明了这样的字典：
private static Dictionary<string, object> aDict = new Dictionary<string, object>();
And now I want to use it at another place. How do I reset it?
现在我想在另一个地方使用它。如何重置？
aDict = new Dictionary<string, object>(); // like this?
aDict = null; // or like this?
or other reset styles?
或其他重置样式？
采纳答案by CMS
回答by Anuraj
Try this
尝试这个
aDict.Clear();
回答by Alan
aDict.Clear();will work.
aDict.Clear();将工作。
回答by manubaum
aDict.Clear();is the only way to go since you don't want to change the reference and keep the same object available at another place
aDict.Clear();是唯一的方法，因为您不想更改引用并在另一个地方保持相同的对象可用
回答by Tore Aurstad
Running a decompile of the Clear method in Resharper on a Dictionary object shows this:
在 Resharper 中对 Dictionary 对象运行 Clear 方法的反编译显示：
/// <summary>Removes all keys and values from the <see cref="T:System.Collections.Generic.Dictionary`2" />.</summary>
[__DynamicallyInvokable]
public void Clear()
{
if (this.count <= 0)
return;
for (int index = 0; index < this.buckets.Length; ++index)
this.buckets[index] = -1;
Array.Clear((Array) this.entries, 0, this.count);
this.freeList = -1;
this.count = 0;
this.freeCount = 0;
++this.version;
}
The dictionary contains an integer array of buckets and other control variables that are either set to -1 or 0 to effectively clear the keys and values from the dictionary object. It is pretty many variables representing a valid state of the Dictionary as we can see in the .NET source code. Interesting.
字典包含桶和其他控制变量的整数数组，这些变量设置为 -1 或 0 以有效清除字典对象中的键和值。正如我们在 .NET 源代码中看到的那样，它有很多变量代表字典的有效状态。有趣的。
回答by frmbelz
Good to call Count before calling Clear if Dictionary might be empty
如果字典可能为空，则在调用 Clear 之前先调用 Count
if (aDict.Count > 0)
{
aDict.Clear();
}
Count is supposedly faster than Clear so you avoid running Clear on zero elements Dictionary.
Count 据说比 Clear 快，因此您可以避免在零元素 Dictionary 上运行 Clear。
