[英]Convert Dictionary in List of of strings in C#
我有以下代码:
var parameters = new Dictionary<string, object>();
parameters.Add("param1", 100);
parameters.Add("param2", "ABC");
parameters.Add("param3", 1.2);
我需要以最大的性能生成以下代码,可以使用Linq,Lambda等。!
var tableName = "table1"
var fields = "param1, param2, param3";
var values = "@param1, @param2, @param3"
var result = String.Format("INSERT INTO {0} ({1}) VALUES ({2})", tableName, fields, values);
...执行Sql AddParamWithValue ....(没关系,我可以做到...)
好的,所以,我做了一些测试,string.join的工作原理非常好:
param = string.Join(",", parameters.Keys);
value = string.Join(",", parameters.Values);
这是我的测试功能:
private static void RunLoopTester()
{
Console.WriteLine("Building dictionary...");
var parameters = new Dictionary<string, string>();
for(var i = 0;i< 10000;i++)
{
parameters.Add(string.Format("param{0}",i),string.Format("value{0}", i));
}
var stopWatch = new Stopwatch();
Console.WriteLine("Using foreach statement...");
stopWatch.Start();
var param = string.Empty;
var value = string.Empty;
foreach(var k in parameters.Keys)
{
param += string.Format("{0}{1}", string.IsNullOrEmpty(param) ? string.Empty : ",", k);
value += string.Format("{0}{1}", string.IsNullOrEmpty(value) ? string.Empty : ",", parameters[k]);
}
stopWatch.Stop();
Console.WriteLine("Elapsed Time: {0}", stopWatch.ElapsedMilliseconds);
Console.WriteLine("Using simple syntax...");
param = string.Empty;
value = string.Empty;
stopWatch.Reset();
stopWatch.Start();
param = string.Join(",", parameters.Keys);
value = string.Join(",", parameters.Values);
stopWatch.Stop();
Console.WriteLine("Elapsed Time: {0}", stopWatch.ElapsedMilliseconds);
Console.ReadLine();
}
结果:
Pick your tester:
1: Timer Test
2: Loop Tester
2
Building dictionary...
Using foreach statement...
Elapsed Time: 1249
Using simple syntax...
Elapsed Time: 1
编辑:接受的帖子。 OP提到proc参数需要@param。 可以将其放在字典的键中(更好),或者如果不能,则可以替换为:
param = string.Join(",", parameters.Keys);
带有:
param = string.Join(",", parameters.Keys).Replace("param","@param");
这会将时间增加到2毫秒。 我尝试在可枚举的键上使用linq select,但这将时间增加到4毫秒。 因此,替换性能更高。
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