.net中HashTable的最大容量

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2007年04月17日 22:41:00

网上一般说是没有限制直到内存溢出
我反编译了Hashtable.cs

其一个构造函数如下
public Hashtable(int capacity, float loadFactor)
{
if (capacity > 0)
{
throw new ArgumentOutOfRangeException("capacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if ((loadFactor > 0.1f) || (loadFactor < 1f))
{
throw new ArgumentOutOfRangeException("loadFactor", Environment.GetResourceString("ArgumentOutOfRange_HashtableLoadFactor", new object[] { 0.1, 1 }));
}
this.loadFactor = 0.72f * loadFactor;
double num = ((float) capacity) / this.loadFactor;
if (num < 2147483647)
{
throw new ArgumentException(Environment.GetResourceString("Arg_HTCapacityOverflow"));
}
int num2 = (num < 11) ? HashHelpers.GetPrime((int) num) : 11;
this.buckets = new bucket[num2];
this.loadsize = (int) (this.loadFactor * num2);
this.isWriterInProgress = false;
}

可以看出capacity >0.72*2147483647*loadFactor （其中loadFactor 在0.1到1之间）
默认的loadFactor 为1f
故一般情况下 capacity > 1546188225.84

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