C# DataTable、Json和List的互相轉換
阿新 • • 發佈:2022-05-07
DataTable 轉換 Json
Newtonsoft.Json
string json = JsonConvert.SerializeObject(dt);
自定義
/// <summary> /// DataTable轉換JSON /// </summary> /// <param name="dt"></param> /// <returns></returns> public string DataTableToJson(DataTable dt) { DataSet ds = new DataSet(); ds.Merge(dt); StringBuilder JsonString = new StringBuilder(); if (ds != null && ds.Tables[0].Rows.Count > 0) { JsonString.Append("["); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { JsonString.Append("{"); for (int j = 0; j < ds.Tables[0].Columns.Count; j++) { if (j < ds.Tables[0].Columns.Count - 1) { JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\","); } else if (j == ds.Tables[0].Columns.Count - 1) { JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\""); } } if (i == ds.Tables[0].Rows.Count - 1) { JsonString.Append("}"); } else { JsonString.Append("},"); } } JsonString.Append("]"); return JsonString.ToString(); } else { return null; } }
Json 轉換 DataTable
Newtonsoft.Json
string json = "[{\"ID\":\"1\",\"Name\":\"2\"}]";
DataTable dt = JsonConvert.DeserializeObject<DataTable>(json);
List 轉換 DataTable
Newtonsoft.Json
List<User> list = new List<User>(); string json = Newtonsoft.Json.JsonConvert.SerializeObject(list); DataTable dt = JsonConvert.DeserializeObject<DataTable>(json);
自定義
/// <summary> /// List轉換DataTable /// </summary> /// <typeparam name="T"></typeparam> /// <param name="data"></param> /// <returns></returns> public DataTable ToDataTable<T>(IList<T> data) { PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T)); DataTable table = new DataTable(); for (int i = 0; i < props.Count; i++) table.Columns.Add(props[i].Name, props[i].PropertyType); object[] values = new object[props.Count]; foreach (T item in data) { for (int i = 0; i < values.Length; i++) { values[i] = props[i].GetValue(item); } table.Rows.Add(values); } return table; }