从DataGrid.ItemsSource检索匿名类型集合 [英] Retrieving Anonymous Type Collection Back From DataGrid.ItemsSource

问题描述

我正在将collection of anonymous type写入WPF DataGrid.ItemsSource.现在我想要它回来.我该怎么做，有可能吗?

I'm writing a collection of anonymous type into WPF DataGrid.ItemsSource. And now I want it back. How do I do this, Is it possible?

如何重建匿名类型?

谢谢！

好的.那你能说这行得通吗?

Ok. So could You say will this work?

if(this.AbcDataGrid.ItemsSource != null && this.XyzDataGrid.ItemsSource != null)
{
    var abcdata = (IEnumerable<dynamic>)this.AbcDataGrid.ItemsSource;
    var xyzdata = (IEnumerable<dynamic>)this.XyzDataGrid.ItemsSource;

    var d1 = abcdata.ToList().OrderByDescending(x => x.Id);
    var d2 = xyzdata.ToList().OrderByDescending(x => x.Id);

    var result = from i1 in d1
                 from i2 in d2
                 select new
                 {
                     Name  = i1.Name,
                     Group = i1.Group.ToString() + i2.Group.ToString()
                 };
} 

属性Group和Name都出现在匿名类型声明中.

Properties Group and Name both present in anonymous type declaration.

推荐答案

有几种选择，但是最好的选择是:不要这样做.匿名类型只应在一个函数中使用，而不是将它们存储在某个地方然后再检索它们.只需创建一个普通的类即可.

There are several options, but the best one is: don't do it. Anonymous types are meant to be used only in one function, not to store them somewhere and then retrieve them. Just create a normal class.

如果您确定要使用匿名类型，则可以使用 cast例如:

If you are sure you want to use anonymous type, you could use cast by example:

var anons = new[] { new { prop1 = 1, prop2 = "bar" }, new { prop1 = 42, prop2 = "foo" } };
IEnumerable casted = anons;
var castedBack = CastByExample(anons, new[] { new { prop1 = 0, prop2 = "" } });

或者您可以使用动态:

var d = (IEnumerable<dynamic>)casted;

请注意，您可以 强制转换为dynamic[]，但这并不安全.另一种选择是强制转换为dynamic，完全保留类型安全性.

Note that you could cast to dynamic[], but doing so is not safe. Another option would be to cast to just dynamic, leaving type-safety completely.

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