C# List<T> 转 DataTable 方法修改版

鼠扑 · 2023-1-4 14:18:34

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

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C# List 转 DataTable - 小政哥01 - 博客园 (cnblogs.com)
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