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之前写了个 List item.toDataTable() 这种链式调用的List转换为DataTable的方法,有两位热心的网友提出了存在的一些缺陷,如果传入的obj参数不是List而是单个object对象或传入的是单类型的List时转换会出错,现对代码进行了些修改,反正代码测试基本是跑通了,对List,单个Object对象,以及List、List这类传入的数据都能转,但还是感觉整个判断过程可能不够严谨,希望高手指正。
之前的代码:C# List 转 DataTable- public static DataTable toDataTable(this object obj,string _tName = null)
- {
- Type t = obj.GetType();
- dynamic ts = obj;
- DataTable DT = new DataTable();
- PropertyInfo[] pi;
- //判断obj是否为单个的实体类
- if (t.Name.IndexOf("List") < 0)
- {
- pi = ts.GetType().GetProperties(BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public);
- DT.TableName = _tName == null ? ts.GetType().ToString() : _tName;
- foreach (PropertyInfo p in pi)
- {
- DT.Columns.Add(p.Name, p.PropertyType);
- }
- DataRow dr1 = DT.NewRow();
- foreach (PropertyInfo p in pi)
- {
- dr1[p.Name] = p.GetValue(ts, null);
- }
- DT.Rows.Add(dr1);
- return DT;
- }
- //判断obj是否为单类型对象
- if (t.ToString().IndexOf("System.String")>=0 || t.ToString().IndexOf("System.Object")>=0
- || t.ToString().IndexOf("System.Int")>=0 || t.ToString().IndexOf("System.Boolean")>=0)
- {
- DT.TableName = _tName == null ? "Table1" : _tName;
- DT.Columns.Add("Column1", typeof(object));
- foreach (var v in ts)
- {
- DataRow dr2 = DT.NewRow();
- dr2["Column1"] = v ;
- DT.Rows.Add(dr2);
- }
- return DT;
- }
- pi = ts[0].GetType().GetProperties(BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public);
- DT.TableName = _tName == null ? ts[0].GetType().ToString() : _tName;
- foreach (PropertyInfo p in pi)
- {
- DT.Columns.Add(p.Name, p.PropertyType);
- }
- DataRow dr = null;
- foreach (var v in ts)
- {
- dr = DT.NewRow();
- foreach (PropertyInfo p in pi)
- {
- dr[p.Name] = p.GetValue(v, null);
- }
- DT.Rows.Add(dr);
- }
- return DT;
- }
复制代码 测试代码:
- private static void ReadDataTableFromList()
- {
- ConnConfig conn = new ConnConfig(dbtype: DBType.SQLServer, connstring: SQLConnStr);
- DBHelper<VMIS_model> vioDB = new DBHelper<VMIS_model>(conn);
- List<VMIS_model> list = vioDB.Select(whereSQL: "PlateNumber=@PN", sqlParams: new ORMParameter[]
- {
- new ORMParameter("@PN","车牌ABCDE")
- });
- Console.WriteLine("List<T>.toDataTable() 测试:");
- DataTable DT = list.toDataTable("List_VMIS");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("单个object.toDataTable() 测试:");
- VMIS_model vi = list.First();
- DT = vi.toDataTable("VMIS");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("List<string>.toDataTable() 测试:");
- List<string> list1 = new List<string>();
- list1.Add("张三");
- list1.Add("李四");
- list1.Add("王五");
- DT = list1.toDataTable("List_String");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("List<int>.toDataTable() 测试:");
- List<int> list2 = new List<int>();
- list2.Add(-2021);
- list2.Add(2022);
- list2.Add(2023);
- DT = list2.toDataTable("List_Int");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("List<long>.toDataTable() 测试:");
- List<long> list3 = new List<long>();
- list3.Add(3232235876000);
- list3.Add(3232235877000);
- list3.Add(-3232235878000);
- DT = list3.toDataTable();
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("List<bool>.toDataTable() 测试:");
- List<bool> list4 = new List<bool>();
- list4.Add(true);
- list4.Add(false);
- DT = list4.toDataTable("List_Bool");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- Console.WriteLine("List<object>.toDataTable() 测试:");
- List<object> list5 = new List<object>();
- list5.Add("张三");
- list5.Add(2022);
- list5.Add(-2023);
- list5.Add(3232235877000);
- list5.Add(-3232235878000);
- list5.Add(true);
- list5.Add(false);
- DT = list5.toDataTable("List_Object");
- Console.WriteLine("数据加载到DataTable 【" + DT.TableName + "】 完成,共载入数据:" + DT.Rows.Count.ToString());
- Console.WriteLine(JsonConvert.SerializeObject(DT, Formatting.Indented));
- Console.WriteLine("----------------------------------------------------------------------");
- }
复制代码 View Code结果:
- List<T> to DataTable 转换测试:
- ---------------------------------------------
- List<T>.toDataTable() 测试:
- 数据加载到DataTable 【List_VMIS】 完成,共载入数据:3
- [
- {
- "ID": "2105082103590123269484848995",
- "PlateNumber": "车牌ABCDE",
- "V_Text": "超速,超过限速110.00%",
- "V_Address": "超速卡口:xxxxx",
- "V_date": "2021-05-08T21:03:43",
- "CarOwner": ""
- },
- {
- "ID": "2105082103590435798531004957",
- "PlateNumber": "车牌ABCDE",
- "V_Text": "超速,超过限速113.33%",
- "V_Address": "超速卡口:xxxxx",
- "V_date": "2021-05-08T21:03:13",
- "CarOwner": ""
- },
- {
- "ID": "2105082147592512464100535248",
- "PlateNumber": "车牌ABCDE",
- "V_Text": "超速,超过限速83.33%",
- "V_Address": "超速卡口:xxxxx",
- "V_date": "2021-05-08T21:47:50",
- "CarOwner": ""
- }
- ]
- ----------------------------------------------------------------------
- 单个object.toDataTable() 测试:
- 数据加载到DataTable 【VMIS】 完成,共载入数据:1
- [
- {
- "ID": "2105082103590123269484848995",
- "PlateNumber": "车牌ABCDE",
- "V_Text": "超速,超过限速110.00%",
- "V_Address": "超速卡口:xxxxx",
- "V_date": "2021-05-08T21:03:43",
- "CarOwner": ""
- }
- ]
- ----------------------------------------------------------------------
- List<string>.toDataTable() 测试:
- 数据加载到DataTable 【List_String】 完成,共载入数据:3
- [
- {
- "Column1": "张三"
- },
- {
- "Column1": "李四"
- },
- {
- "Column1": "王五"
- }
- ]
- ----------------------------------------------------------------------
- List<int>.toDataTable() 测试:
- 数据加载到DataTable 【List_Int】 完成,共载入数据:3
- [
- {
- "Column1": -2021
- },
- {
- "Column1": 2022
- },
- {
- "Column1": 2023
- }
- ]
- ----------------------------------------------------------------------
- List<long>.toDataTable() 测试:
- 数据加载到DataTable 【Table1】 完成,共载入数据:3
- [
- {
- "Column1": 3232235876000
- },
- {
- "Column1": 3232235877000
- },
- {
- "Column1": -3232235878000
- }
- ]
- ----------------------------------------------------------------------
- List<bool>.toDataTable() 测试:
- 数据加载到DataTable 【List_Bool】 完成,共载入数据:2
- [
- {
- "Column1": true
- },
- {
- "Column1": false
- }
- ]
- ----------------------------------------------------------------------
- List<object>.toDataTable() 测试:
- 数据加载到DataTable 【List_Object】 完成,共载入数据:7
- [
- {
- "Column1": "张三"
- },
- {
- "Column1": 2022
- },
- {
- "Column1": -2023
- },
- {
- "Column1": 3232235877000
- },
- {
- "Column1": -3232235878000
- },
- {
- "Column1": true
- },
- {
- "Column1": false
- }
- ]
- ----------------------------------------------------------------------
复制代码 View Code
C# List 转 DataTable - 小政哥01 - 博客园 (cnblogs.com)
来源:https://www.cnblogs.com/xzg2022/archive/2023/01/04/17023830.html
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