报表速度提升

HT.Cloud.Code/Extend/Ext.Table.cs

@@ -5,7 +5,9 @@
  * Website：
 *********************************************************************************/
 
+using System;
 using System.Data;
+using System.Text;
 
 namespace HT.Cloud.Code
 {
@@ -66,5 +68,44 @@ namespace HT.Cloud.Code
 				return null;
 			}
 		}
-	}
+
+        /// <summary>
+        /// 转换为json字符串
+        /// </summary>
+        /// <returns></returns>
+        ///
+        public static string ToJson(this DataTable dt)
+        {
+            StringBuilder jsonString = new StringBuilder();
+            jsonString.Append("[");
+            DataRowCollection drc = dt.Rows;
+            for (int i = 0; i < drc.Count; i++)
+            {
+                jsonString.Append("{");
+                for (int j = 0; j < dt.Columns.Count; j++)
+                {
+                    string strKey = dt.Columns[j].ColumnName;
+                    string strValue = drc[i][j].ToString();
+                    Type type = dt.Columns[j].DataType;
+                    jsonString.Append("\"" + strKey + "\":");
+                    strValue = String.Format(strValue, type);
+                    if (j < dt.Columns.Count - 1)
+                    {
+                        jsonString.Append(strValue + ",");
+                    }
+                    else
+                    {
+                        jsonString.Append(strValue);
+                    }
+                }
+                jsonString.Append("},");
+            }
+            if (jsonString.Length > 1)
+            {
+                jsonString.Remove(jsonString.Length - 1, 1);
+            }
+            jsonString.Append("]");
+            return jsonString.ToString();
+        }
+    }
 }