无法将类型 IEnumerable 转换为 ObservableCollection...您是否缺少演员表? [英] Cannot convert type IEnumerable to ObservableCollection...are you missing a cast?

问题描述

我正在尝试返回布尔值isAssy"为真的实体:

I'm trying to return entities where the bool "isAssy" is true:

 public ObservableCollection<MasterPartsList> ParentAssemblyBOM
 {
      get {return this._parentAssemblyBOM.Where(parent => parent.isAssy == true); }
 }

但是整个语句都用红色下划线表示我不能将类型 IEnumerable 转换为 ObservableCollection...你错过了演员表吗?"

but the entire statement is underlined in red stating that I cannot "convert type IEnumerable to ObservableCollection...are you missing a cast?"

推荐答案

ObservableCollection 有一个 重载构造函数 接受 IEnumerable 作为参数.假设您的 Linq 语句返回 MasterPartsList 项的集合:

ObservableCollection<T> has an overloaded constructor that accepts an IEnumerable<T> as a parameter. Assuming that your Linq statement returns a collection of MasterPartsList items:

public ObservableCollection<MasterPartsList> ParentAssemblyBOM
{
    get 
    {
        var enumerable = this._parentAssemblyBOM
                             .Where(parent => parent.isAssy == true);

        return new ObservableCollection<MasterPartsList>(enumerable); 
    }
}

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