在 C# 中的字符串列表中转换字典

Convert Dictionary in List of of strings in C#

我有这个代码:

var parameters = new Dictionary<string, object>();
parameters.Add("param1", 100);
parameters.Add("param2", "ABC");
parameters.Add("param3", 1.2);

我需要以最大性能生成下面的代码,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);

... Execute Sql AddParamWithValue....(this is okay I can do it...)

好的,所以,我做了一点测试,string.join 效果非常好:

param = string.Join(",", parameters.Keys);
value = string.Join(",", parameters.Values);

这是我的测试函数:

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:Post 已接受。 OP提到proc参数需要@param。这可以通过将它放在字典的键中(更好)或者,如果你不能,那么你可以替换:

param = string.Join(",", parameters.Keys);

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。所以替换的性能更高。