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Uri uri=new Uri( "http://127.0.0.1:1111/Upload/20200417/aaa9754-4865-808e-94738f636b6c.png");
string path = uri.LocalPath;
string aaa = @"http://127.0.0.1:1111/Upload/20200417/aaa9754-4865-808e-94738f636b6c.png";
List<string> splitA = aaa.Split('/').ToList();
string result = string.Join("/", splitA.GetRange(3, splitA.Count - 3));
string aaa = @"http://127.0.0.1:1111/Upload/20200417/aaa9754-4865-808e-94738f636b6c.png";
//正则
var res = Regex.Match(aaa, "Upload(.+)");
//split方式
var res1 = "Upload" + aaa.Split(new string[] { "Upload" }, StringSplitOptions.RemoveEmptyEntries)[1];
//substring方式
var res2 = aaa.Substring(aaa.IndexOf("Upload"));