c# 在 while 循環中使用 JavaScriptSerializer 序列化程序並返回客戶端到 Json.Parse。 出錯

Question

誰能給我一個步驟來解決這個錯誤以獲取輸出。 編碼新手。

第 1 步：使用 Json/Javascript 調用 .cs 文件（c#）中的方法

 var markers = JSON.parse('<%=ConvertDataTabletoString("NewGetTaskWorkPercentage1",null) %>');

第 2 步：

.cs file code for method ConvertDataTabletoString
 public string ConvertDataTabletoString(string Sql, string prjno)
        {
            //var qprojectno = Request.QueryString["ProjectNo"].ToString();
            param1.Value = "P-2020-0009";  //aspx hidden field
           DataTable dt = new DataTable();
            using (con = new SqlConnection(connectionString))
            {
                using (cmd = new SqlCommand(Sql, con))
                {
                    string connetionString = "Data Source = ; Initial Catalog = DashBoardDB; User ID = ; Password = ";
                    SqlConnection connection = new SqlConnection(connetionString);
                    connection.Open();
                     string sql1 = "SELECT InstanceId,Module,SubModule,Process FROM Xtable WHERE ProjectNo=" + "'" + param1.Value + "'"+ "and instanceid='aabed4df-3e91-41c0-8788-2e7d31eecfd8'";

                    SqlCommand command = new SqlCommand(sql1, connection);
                    command.CommandTimeout = 600;
                    SqlDataReader dataReader = command.ExecuteReader();
                  serializedResult = " ";
                    while (dataReader.Read())
                    {
                       string strInsId = " ";
                        string strProcess = "";
                      strInsId = dataReader["InstanceId"].ToString();
                       con.Open();
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.Clear();
                        cmd.Parameters.Add(new SqlParameter("@ProjectNo", prjno));
                        cmd.Parameters.Add(new SqlParameter("@InstanceId", strInsId));
                        sda = new SqlDataAdapter(cmd);
                        sda.Fill(dt);
System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
                        List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                        Dictionary<string, object> row;

                        foreach (DataRow dr in dt.Rows)
                        {
                            Console.WriteLine(dr + " " + dt.Rows);
                            row = new Dictionary<string, object>();
                            foreach (DataColumn col in dt.Columns)
                            {
                                 row.Add(col.ColumnName, dr[col]); 
                            }
                            rows.Add(row);
                        }

                        serializedResult = serializer.Serialize(rows);
                        serializedResult += serializer.Serialize(rows); **two times concatenating**
                        con.Close();}
                       dataReader.Close();
                    command.Dispose();
                    connection.Close();
                    return serializedResult;
                   }
 }

        }

第 3 步：附上圖片

在客戶端如何將此值拆分為數組。 我需要這樣的輸出。 如何在客戶端獲取數組中的輸出和數組的長度。 謝謝

數組 1：

 [{"Task":"Feature 1.1.3","OverallSubtaskDuration":17.00,"ActualStart":"2019/10/18","ActualEnd":"2020/03/13","OverallSubtaskPercentage":283.33},
  {"Task":"Feature 1.1.3","OverallSubtaskDuration":8.00,"ActualStart":"2019/10/18","ActualEnd":"2019/10/25","OverallSubtaskPercentage":133.33},
  {"Task":"Feature 1.1.3","OverallSubtaskDuration":3.00,"ActualStart":"2020/03/11","ActualEnd":"2020/03/13","OverallSubtaskPercentage":50.00},
  {"Task":"Feature 1.1.3","OverallSubtaskDuration":3.00,"ActualStart":"2019/10/27","ActualEnd":"2019/10/29","OverallSubtaskPercentage":50.00}]

數組 2：

[{"Task":"Feature 1.1.3","OverallSubtaskDuration":17.00,"ActualStart":"2019/10/18","ActualEnd":"2020/03/13","OverallSubtaskPercentage":283.33},
 {"Task":"Feature 1.1.3","OverallSubtaskDuration":8.00,"ActualStart":"2019/10/18","ActualEnd":"2019/10/25","OverallSubtaskPercentage":133.33},
 {"Task":"Feature 1.1.3","OverallSubtaskDuration":3.00,"ActualStart":"2020/03/11","ActualEnd":"2020/03/13","OverallSubtaskPercentage":50.00},
 {"Task":"Feature 1.1.3","OverallSubtaskDuration":3.00,"ActualStart":"2019/10/27","ActualEnd":"2019/10/29","OverallSubtaskPercentage":50.00}]

Answer 1

JSON 結果必須是對象或數組。

您創建的結果是兩個背靠背的數組，因此不是有效的 JSON，您可以使用在線驗證器（例如https://jsonlint.com/）進行測試

因此，您要么需要使用其他兩個數組中的所有元素創建一個大數組，要么需要將兩個數組包裝到一個包裝器對象中。

對您來說，最簡單的方法，因為您已經在使用 List<>，因此將其與自身組合並返回結果。

//Add the "rows" list to itself, so you double it.
rows.AddRange(rows);
serializedResult = serializer.Serialize(rows);
...
return serializedResult;

如果您需要保持列表不同，那么您必須使用包裝器對象。 像這樣;

public class Wrapper
{
    public List<Dictionary<string, object>> Array1 { get; set;  }
    public List<Dictionary<string, object>> Array2 { get; set; }
}

然后你像這樣連載

serializedResult = serializer.Serialize(new Wrapper() { Array1 = rows, Array2 = rows };);
...
return serializedResult;

Answer 2

您可以使用 newtonsoft json dll 從 .cs 創建 json 文件，並使用鏈接檢查 json 字符串： https ://jsoneditoronline.org/