我正在处理包含字符串数组的字典列表。这些字典是通过循环在DataTable
上定义/填充的。在下面的代码中,测试评估为false(两次),有人可以告诉我为什么?字符串数组查找字典
List<Dictionary<string[], int>> mydix = new List<Dictionary<string[], int>>();
mydix.Add(new Dictionary<string[], int>());
mydix.Add(new Dictionary<string[], int>());
mydix.Add(new Dictionary<string[], int>());
string[] s = {"tree"};
mydix[1].Add(s, 1);
bool test = mydix[1].ContainsKey(s); // This evaluates to true, which I understand
var entry= mydix[1][s]; // This is 1
DataTable dt=new DataTable();
dt.Columns.Add("test");
dt.Rows.Add(new string[] {"key"});
mydix[2].Add(dt.Rows[0].ItemArray.Select(x => x.ToString()).ToArray(), 2);
test = mydix[2].ContainsKey(new string[] { "key" }); // Why does this evaluate to false?
// Here is an example with an array with two elements
DataTable dt2 = new DataTable();
dt2.Columns.Add("test");
dt2.Columns.Add("test2");
string[] t={"tree1","tree2"};
dt2.Rows.Add(t);
mydix[0].Add(dt2.Rows[0].ItemArray.Select(x => x.ToString()).ToArray(), 3);
test = mydix[0].ContainsKey(t); // Why does this evaluate to false?
[This](http://stackoverflow.com/questions/670063/getting-hash-of-a-list-of-strings) 帮助我将散列函数概括为字符串 – user2546346