/// <summary>
/// IL动态代码(Emit)，T转DataRow
/// </summary>
public static DataRow ToDataRow(this object obj)
{
var type = obj.GetType();
var table = type.CreateTable();
var builder = DataTableBuilder.CreateBuilder(type);
{
var dr = table.NewRow();
builder.Build(obj, dr);
return(dr);
}
}
/// <summary>
/// IL动态代码(Emit)，List转DataTable（Excel）
/// </summary>
public static DataTable ToExcelTable(this IList list)
{
var type = list.GenericType();
var table = type.CreateExcelTable();
var builder = DataTableBuilder.CreateBuilder(type, true);
foreach (var item in list)
{
var dr = table.NewRow();
builder.Build(item, dr);
table.Rows.Add(dr);
}
return(table);
}
/// <summary>
/// IL动态代码，创建委托
/// </summary>
public static DataTableBuilder CreateBuilder(Type type, bool iExcel = false)
{
var setValueMethod = typeof(DataRow).GetMethod("set_Item", new Type[] { typeof(string), typeof(object) });
var dymMethod = new DynamicMethod(type.Name + nameof(DataTableBuilder), null, new Type[] { typeof(object), typeof(DataRow) }, true);
ILGenerator generator = dymMethod.GetILGenerator();
foreach (var property in type.PropertiesValue())
{
if (iExcel && !property.IExcel())
{
continue;
}
Label endIfLabel = generator.DefineLabel();
if (property.PropertyType.IsGenericType)
{
generator.GetValue(property, type);//获取引用值
generator.Emit(OpCodes.Brfalse, endIfLabel);
}
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldstr, property.Column());
generator.GetValue(property, type);//获取引用值
generator.Emit(OpCodes.Callvirt, setValueMethod);
if (property.PropertyType.IsGenericType)
{
generator.MarkLabel(endIfLabel);
}
}
generator.Emit(OpCodes.Ret);
var builder = new DataTableBuilder
{
handler = dymMethod.CreateDelegate(typeof(Action <object, DataRow>))
};
return(builder);
}
