将IEnumerable转换为DataTable [英] Convert IEnumerable to DataTable
问题描述
我可以使用反射来获取属性和值,但这似乎有点低效,是否有内置的东西?
(我知道例如:ObtainDataTableFromIEnumerable)
编辑:
此问题通知我处理空值的问题。
我下面写的代码正确处理空值。
public static DataTable ToDataTable< T>(这个IEnumerable< T>项目){
//创建结果表,并收集T
的所有属性DataTable table = new DataTable typeof(T).Name);
PropertyInfo [] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
//将属性作为列添加到datatable
foreach(pro prop中的var prop){
Type propType = prop.PropertyType;
//是否为可空类型?获取底层类型
if(propType.IsGenericType&& propType.GetGenericTypeDefinition()。Equals(typeof(Nullable)))
propType = new NullableConverter(propType).UnderlyingType;
table.Columns.Add(prop.Name,propType);
}
//将每个T的属性值作为行添加到datatable
foreach(项目中的var项目){
var values = new object [props。长度];
for(var i = 0; i< props.Length; i ++)
values [i] = props [i] .GetValue(item,null);
table.Rows.Add(values);
}
返回表;
}
看看这个: a href =http://www.chinhdo.com/20090402/convert-list-to-datatable/ =noreferrer>将列表/ IEnumerable转换为DataTable / DataView
在我的代码中,我将其更改为扩展方法:
public static DataTable ToDataTable< T> (这个List< T>项目)
{
var tb = new DataTable(typeof(T).Name);
PropertyInfo [] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach(道具中的var prop)
{
tb.Columns.Add(prop.Name,prop.PropertyType);
}
foreach(项目中的项目)
{
var values = new object [props.Length];
for(var i = 0; i< props.Length; i ++)
{
values [i] = props [i] .GetValue(item,null);
}
tb.Rows.Add(values);
}
return tb;
}
Is there a nice way to convert an IEnumerable to a DataTable?
I could use reflection to get the properties and the values, but that seems a bit inefficient, is there something build-in?
(I know the examples like: ObtainDataTableFromIEnumerable)
EDIT:
This question notified me of a problem handling null values.
The code I wrote below handles the null values properly.
public static DataTable ToDataTable<T>(this IEnumerable<T> items) {
// Create the result table, and gather all properties of a T
DataTable table = new DataTable(typeof(T).Name);
PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
// Add the properties as columns to the datatable
foreach (var prop in props) {
Type propType = prop.PropertyType;
// Is it a nullable type? Get the underlying type
if (propType.IsGenericType && propType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
propType = new NullableConverter(propType).UnderlyingType;
table.Columns.Add(prop.Name, propType);
}
// Add the property values per T as rows to the datatable
foreach (var item in items) {
var values = new object[props.Length];
for (var i = 0; i < props.Length; i++)
values[i] = props[i].GetValue(item, null);
table.Rows.Add(values);
}
return table;
}
Look at this one: Convert List/IEnumerable to DataTable/DataView
In my code I changed it into a extension method:
public static DataTable ToDataTable<T>(this List<T> items)
{
var tb = new DataTable(typeof(T).Name);
PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach(var prop in props)
{
tb.Columns.Add(prop.Name, prop.PropertyType);
}
foreach (var item in items)
{
var values = new object[props.Length];
for (var i=0; i<props.Length; i++)
{
values[i] = props[i].GetValue(item, null);
}
tb.Rows.Add(values);
}
return tb;
}
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