1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks; namespace Common { public class ModelHelper { public static List<T> TableToEntity<T>(DataTable dt) where T : new() { List<T> lists = new List<T>(); if (dt.Rows.Count > 0) { foreach (DataRow row in dt.Rows) { lists.Add(SetVal(new T(), row)); } } return lists; } public static T SetVal<T>(T entity, DataRow row) where T : new() { Type type = typeof(T); PropertyInfo[] pi = type.GetProperties(); foreach (PropertyInfo item in pi) { if (row[item.Name] != null && row[item.Name] != DBNull.Value) { if (item.PropertyType.IsGenericType && item.PropertyType.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) { Type conversionType = item.PropertyType; NullableConverter nullableConverter = new NullableConverter(conversionType); conversionType = nullableConverter.UnderlyingType; item.SetValue(entity, Convert.ChangeType(row[item.Name], conversionType), null); } else { item.SetValue(entity, Convert.ChangeType(row[item.Name], item.PropertyType), null); } } } return entity; } public static DataTable EntityToDataTable<T>(List<T> list) where T : new() { if (list == null || list.Count == 0) { return null; } DataTable dataTable = new DataTable(typeof(T).Name); foreach (PropertyInfo propertyInfo in typeof(T).GetProperties()) { if (propertyInfo.PropertyType.IsGenericType && propertyInfo.PropertyType.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) { Type conversionType = propertyInfo.PropertyType; NullableConverter nullableConverter = new NullableConverter(conversionType); conversionType = nullableConverter.UnderlyingType; dataTable.Columns.Add(new DataColumn(propertyInfo.Name, conversionType)); } else { dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType)); } } foreach (T model in list) { DataRow dataRow = dataTable.NewRow(); foreach (PropertyInfo propertyInfo in typeof(T).GetProperties()) { object value = propertyInfo.GetValue(model, null); if (value != null) { dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null); } else { dataRow[propertyInfo.Name] = DBNull.Value; } } dataTable.Rows.Add(dataRow); } return dataTable; } } }
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using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Linq;
using
System.Reflection;
using
System.Text;
using
System.Threading.Tasks;
namespace
Common
{
public
class
ModelHelper
{
public
static
List<T> TableToEntity<T>(DataTable dt)
where
T :
new
()
{
List<T> lists =
new
List<T>();
if
(dt.Rows.Count > 0)
{
foreach
(DataRow row
in
dt.Rows)
{
lists.Add(SetVal(
new
T(), row));
}
}
return
lists;
}
public
static
T SetVal<T>(T entity, DataRow row)
where
T :
new
()
{
Type type =
typeof
(T);
PropertyInfo[] pi = type.GetProperties();
foreach
(PropertyInfo item
in
pi)
{
if
(row[item.Name] !=
null
&& row[item.Name] != DBNull.Value)
{
if
(item.PropertyType.IsGenericType && item.PropertyType.GetGenericTypeDefinition().Equals(
typeof
(Nullable<>)))
{
Type conversionType = item.PropertyType;
NullableConverter nullableConverter =
new
NullableConverter(conversionType);
conversionType = nullableConverter.UnderlyingType;
item.SetValue(entity, Convert.ChangeType(row[item.Name], conversionType),
null
);
}
else
{
item.SetValue(entity, Convert.ChangeType(row[item.Name], item.PropertyType),
null
);
}
}
}
return
entity;
}
public
static
DataTable EntityToDataTable<T>(List<T> list)
where
T :
new
()
{
if
(list ==
null
|| list.Count == 0)
{
return
null
;
}
DataTable dataTable =
new
DataTable(
typeof
(T).Name);
foreach
(PropertyInfo propertyInfo
in
typeof
(T).GetProperties())
{
if
(propertyInfo.PropertyType.IsGenericType && propertyInfo.PropertyType.GetGenericTypeDefinition().Equals(
typeof
(Nullable<>)))
{
Type conversionType = propertyInfo.PropertyType;
NullableConverter nullableConverter =
new
NullableConverter(conversionType);
conversionType = nullableConverter.UnderlyingType;
dataTable.Columns.Add(
new
DataColumn(propertyInfo.Name, conversionType));
}
else
{
dataTable.Columns.Add(
new
DataColumn(propertyInfo.Name, propertyInfo.PropertyType));
}
}
foreach
(T model
in
list)
{
DataRow dataRow = dataTable.NewRow();
foreach
(PropertyInfo propertyInfo
in
typeof
(T).GetProperties())
{
object
value = propertyInfo.GetValue(model,
null
);
if
(value !=
null
)
{
dataRow[propertyInfo.Name] = propertyInfo.GetValue(model,
null
);
}
else
{
dataRow[propertyInfo.Name] = DBNull.Value;
}
}
dataTable.Rows.Add(dataRow);
}
return
dataTable;
}
}
}
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