HTTP POST读取响应为常规字符串

我目前正在做一个API HTTP POST项目。我应该得到

"[{'"ID'":'"311d1977-4772-435a-92aa-028791c53154'",'"ParentID'":'"187a064e-ffea-45a2-9264-9acecff911e1'",'"Type'":'"txt'",'"OwnerID'":'"5bd087f0-070d-48bd-98b4-10ffa4b3b792'",'"Name'":'"Davinshi.txt'",'"CreatedBy'":'"5bd087f0-070d-48bd-98b4-10ffa4b3b792'",'"CreatedDate'":'"2015-06-05T04:11:33.187'",'"Status'":0,'"Mark'":null},{'"ID'":'"25c80f4e-679c-4093-ade9-0b99da480153'",'"ParentID'":'"187a064e-ffea-45a2-9264-9acecff911e1'",'"Type'":'"jpg'",'"OwnerID'":'"5bd087f0-070d-48bd-98b4-10ffa4b3b792'",'"Name'":'"leonid afremov.jpg'",'"CreatedBy'":'"5bd087f0-070d-48bd-98b4-10ffa4b3b792'",'"CreatedDate'":'"2015-06-05T04:11:46.61'",'"Status'":0,'"Mark'":null}

然而，随着下面的代码，我得到一个奇怪的输出

using (var client = new WebClient())
            {
                var val = new NameValueCollection();
                foreach (var item in values)
                {
                    val.Add(item.Key, item.Value);
                }
                var response = client.UploadValues(url, val);
                return Encoding.Default.GetString(response);
            }

输出

'"[{'''"ID'''":'''"311d1977-4772-435a-92aa-028791c53154'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Davinshi.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:33.187'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"25c80f4e-679c-4093-ade9-0b99da480153'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"leonid afremov.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:46.61'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"5648cc67-1408-4935-a656-0f9b5116db8d'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"misty mood leonid.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:49.437'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"7402e7b8-1ec4-4bf8-9042-142a69cecbcd'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"winter sparkle.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:12:03.26'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"7159e926-1601-41d6-8dce-20e5daab90a6'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"gentle rain beata sasik.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:40.6'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"e61f7bc4-bebf-403b-a478-22b36856a6df'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"MoonLight.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:50.797'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"e46e6250-655b-4105-a888-2574750f2944'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"blue fire.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:27.037'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"bfca703b-1720-4a67-b0a4-2f6146c820aa'''",'''"ParentID'''":null,'''"Type'''":'''"folder'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"School'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:17.96'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"5c1bf9ca-b368-46c8-9804-3254eda00806'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Woman.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:12:06.607'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"8ad07f3c-7a57-4add-92c0-329aca372c8b'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"intimacy worship.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:40.727'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"ac5384c4-66ca-45cd-99f0-437c0789a26a'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Under the Rain.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:12:01.007'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"aa731f04-cc4e-4349-9268-4476ff04b473'''",'''"ParentID'''":'''"bfca703b-1720-4a67-b0a4-2f6146c820aa'''",'''"Type'''":'''"folder'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Marsiling Secondary School'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:20.983'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"af650810-0538-432e-8bf3-47429eb17d27'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"finger paintings.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:35.65'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"ddac31de-2b67-4f56-aefd-508a8f49926f'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"My Love.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:56.55'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"f2454474-d834-4bd1-992e-548cdc2734c1'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"boat.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:28.813'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"e1f5be01-29c7-4ca9-ae6f-5ddf8638cc67'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Davinshi.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:34.687'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"ff3a7365-7b4e-4a46-b545-6a2f889ff898'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"landscape paintings.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:44.48'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"327bf043-1e88-4265-ba5e-6de8394a0d84'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"lord rama.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:47.753'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"1d8a01de-da06-466d-8b7d-6e0bb8478d5e'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"intimacy worship.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:41.617'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"f23103ec-0d8c-407b-9f20-719f0577c274'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Coast of Sicily.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:32.187'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"374779d5-16e9-417f-808f-87fcf85035b0'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"misty mood leonid.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:54.203'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"f0bb2dc7-eac3-407d-a85a-886aaf161fc2'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"boat.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:28.907'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"607ee7b8-7287-4f3f-9867-8a8069562d3c'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"jpg'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Ballet.jpg'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:24.167'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"246b349e-ab32-407a-90ff-8df18bbabc68'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"Ballet.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:23.917'''",'''"Status'''":0,'''"Mark'''":null},{'''"ID'''":'''"457d722f-a675-4523-bd83-8f309dcd254e'''",'''"ParentID'''":'''"187a064e-ffea-45a2-9264-9acecff911e1'''",'''"Type'''":'''"txt'''",'''"OwnerID'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"Name'''":'''"finger paintings.txt'''",'''"CreatedBy'''":'''"5bd087f0-070d-48bd-98b4-10ffa4b3b792'''",'''"CreatedDate'''":'''"2015-06-05T04:11:39.017'''",'''"Status'''":0,'''

我认为HTTP POST响应正在读取字符串作为逐字字符串。你知道我该怎么解决吗?

谢谢!