无法将IEnumerable类型转换为ObservableCollection ...您是否丢失了一个演员？

问题描述

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

但整个语句都带有下划线，表示我无法转换类型IEnumerable to ObservableCollection ...你错过了一个演员？

解决方案

ObservableCollection< T> code>有一个，它接受一个 IEnumerable< T> 作为参数。假设您的Linq语句返回一组 MasterPartsList 项目：

  public的ObservableCollection< MasterPartsList> ParentAssemblyBOM 
 {
 get 
 {
 var enumerable = this._parentAssemblyBOM 
 .Where（parent => parent.isAssy == true）; 
 
返回新的ObservableCollection< MasterPartsList>（可枚举）; 
} 
} 
  




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); }
 }

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

解决方案

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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