list转换成DataTable类如下：
public static DataTable ToDataTable<T>(this IList<T> datas)
{
DataTable dt = new DataTable();
Type type = typeof(T);
PropertyInfo[] properties = type.GetProperties();
List<KeyValuePair<PropertyInfo, ExportFieldAttribute>> propertyInfos = new List<KeyValuePair<PropertyInfo, ExportFieldAttribute>>(); //获取需要导出列信息
foreach (PropertyInfo propertyInfo in properties)
{
ExportFieldAttribute attribute = Attribute.GetCustomAttribute(propertyInfo, typeof(ExportFieldAttribute)) as ExportFieldAttribute;
if (attribute != null)
{
propertyInfos.Add(new KeyValuePair<PropertyInfo, ExportFieldAttribute>(propertyInfo, attribute));
}
} propertyInfos= propertyInfos.OrderBy(p => p.Value.Sort).ToList();//列排序 //添加列
propertyInfos.ForEach(p =>
{
DataColumn dataColumn = new DataColumn(p.Key.Name, p.Key.PropertyType);
dt.Columns.Add(dataColumn);
} ); datas.ToList().ForEach(data =>
{
DataRow dtRow = dt.NewRow();
foreach (PropertyInfo propertyInfo in propertyInfos.Select(p => p.Key))
{
dtRow[propertyInfo.Name] = propertyInfo.GetValue(data, null);
}
dt.Rows.Add(dtRow);
}
);
////填充数据
//foreach (T data in datas)
//{
// DataRow dtRow = dt.NewRow();
// foreach (PropertyInfo propertyInfo in propertyInfos.Select(p=>p.Key))
// {
// dtRow[propertyInfo.Name]=propertyInfo.GetValue(data, null);
// }
// dt.Rows.Add(dtRow);
//} return dt;
}
属性类如下：
public class ExportFieldAttribute : Attribute
{
public ExportFieldAttribute()
{
} public ExportFieldAttribute(int sort)
{
Sort = sort;
}
public int Sort { get; set; }//排序
}
属性标记的类如下：
public class DiscardStatics
{
private string _sn; [ExportFieldAttribute(Sort=)]
public string Sn
{
get { return _sn; }
set { _sn = value; }
} private string _propertyName; [ExportFieldAttribute()]
public string PropertyName
{
get { return _propertyName; }
set { _propertyName = value; }
}
private string aa { get; set; } private string _type;
[ExportFieldAttribute()]
public string Type
{
get { return _type; }
set { _type = value; }
} private DateTime _discardTime;
[ExportFieldAttribute()]
public DateTime DiscardTime
{
get { return _discardTime; }
set { _discardTime = value; }
} private double residuals;
[ExportFieldAttribute()]
public double Residuals
{
get { return residuals; }
set { residuals = value; }
} private string _propertyId;
public string PropertyId
{
get { return _propertyId; }
set { _propertyId = value; }
} private string _brand;
public string Brand
{
get { return _brand; }
set { _brand = value; }
} private string _supplier;
public string Supplier
{
get { return _supplier; }
set { _supplier = value; }
} private string _contactInfo;
public string ContactInfo
{
get { return _contactInfo; }
set { _contactInfo = value; }
} private string _childPtyId;
public string ChildPtyId
{
get { return _childPtyId; }
set { _childPtyId = value; }
} private string _childPtyName;
public string ChildPtyName
{
get { return _childPtyName; }
set { _childPtyName = value; }
}
}