Question

我需要将Ienumerable转换为数据集。为此，我需要编写一个通用功能来将任何IEnumberable类型转换为Dataset。为此，我需要设置匿名类型。这是代码

public static DataTable ToDataTable(Object alist)
        {
            String AssemblyName  = "DataAccessLayer";
            String ClassName = "sptblSystemPreference_GetListResult";
            Type ObjType = Type.GetType(ClassName + "," + AssemblyName);

//Below line working fine... But how can i implement ObjType in the IEnumberable
            IEnumerable<DataAccessLayer.sptblSystemPreference_GetListResult> objList1 = (IEnumerable<DataAccessLayer.sptblSystemPreference_GetListResult>)alist;
            List<DataAccessLayer.sptblSystemPreference_GetListResult> objList = objList1.ToList();

            DataTable dt = new DataTable();

            if (objList[0] != null)
            {
                dt.TableName = objList[0].GetType().Name;
                System.Reflection.PropertyInfo[] propInfo = objList[0].GetType().GetProperties();
                for (int PropertyCount = 0; PropertyCount < propInfo.Length; PropertyCount++)
                {
                    dt.Columns.Add(propInfo[PropertyCount].Name);
                }
                for (int row = 0; row < objList.Count; row++)
                {
                    DataRow dr;
                    dr = dt.NewRow();
                    for (int PropertyCount = 0; PropertyCount < propInfo.Length; PropertyCount++)
                    {

                        Object obj = propInfo[PropertyCount].GetValue(objList[row], null);
                        if(obj!=null)
                            dr[PropertyCount] =  obj;
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;           

        }
    }

Answer 1

我实施此操作是为了将IList<T>转换为DataTable并将其记录在我的博客上：

public static class ListExtensions
{
    public static DataTable ToDataTable<T>(this IList<T> list)
    {
        IList<PropertyInfo> properties = list.GetPropertiesOfObjectInList();
        DataTable resultTable = CreateTable(properties);

        foreach(var item in list)
        {
            var row = CreateRowFromItem<T>(resultTable, item);
            resultTable.Rows.Add(row);
        }

        return resultTable;
    }

    private static DataTable CreateTable(IList<PropertyInfo> properties)
    {
        DataTable resultTable = new DataTable();
        foreach (var property in properties)
        {
            resultTable.Columns.Add(property.Name, property.PropertyType);
        }
        return resultTable;
    }

    public static IList<PropertyInfo> GetPropertiesOfObjectInList<T>(this IList<T> list)
    {
        return typeof(T).GetProperties().ToList();
    }

    private static DataRow CreateRowFromItem<T>(DataTable resultTable, T item)
    {
        var row = resultTable.NewRow();
        var properties = item.GetType().GetProperties().ToList();
        foreach (var property in properties)
        {
            row[property.Name] = property.GetValue(item, null);
        }
        return row;
    }
}

这允许您编写像DataTable yourTable = yourList.ToDataTable()这样的代码。您可以在此处阅读：Generic list to DataTable

.net如何为IEnumerable设置匿名类型

1 个答案: