的区别是什么?AttributeCollection.Contains(TKey)
和 AttributeCollection.ContainsKey(TKey)
? 我看不出有什么不同 官方手册.
var stuff = new Entity("abc_stuff");
stuff.Attributes.Add(new KeyValuePair<string, object>(
"kvp", 12));
stuff.Attributes.Add("txt", "foo");
stuff.Attributes.Add("null", null);
var containsKvp = stuff.Attributes.Contains("kvp"); // true
var containsKvpKey = stuff.Attributes.ContainsKey("kvp"); // true
var containsTxt = stuff.Attributes.Contains("txt"); // true
var containsTxtKey = stuff.Attributes.ContainsKey("txt"); // true
var containsNull = stuff.Attributes.Contains("null"); // true
var containsNullKey = stuff.Attributes.ContainsKey("null"); // true
var containsFoo = stuff.Attributes.Contains("foo"); // false
var containsFooKey = stuff.Attributes.ContainsKey("foo"); // false
这个方法 Contains
称为 ContainsKey
方法的内部。你可以看到生成的IL代码。