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                # Compiler Error CS1640 foreach 語句不能對“type”類型的變量進行操作,因為它實現“interface”的多個實例化,請嘗試強制轉換為特定的接口實例化 此類型從&lt;T&gt; 的兩個或更多的實例繼承,這意味著不存在 **foreach** 可以使用的類型唯一枚舉。指定 IEnumeratorr&lt;T&gt; 的類型,或使用其他循環構造。 下面的示例生成 CS1640: ``` // CS1640.cs using System; using System.Collections; using System.Collections.Generic; public class C : IEnumerable, IEnumerable<int>, IEnumerable<string> { IEnumerator<int> IEnumerable<int>.GetEnumerator() { yield break; } IEnumerator<string> IEnumerable<string>.GetEnumerator() { yield break; } IEnumerator IEnumerable.GetEnumerator() { return (IEnumerator)((IEnumerable<string>)this).GetEnumerator(); } } public class Test { public static int Main() { foreach (int i in new C()){} // CS1640 // Try specifing the type of IEnumerable<T> // foreach (int i in (IEnumerable<int>)new C()){} return 1; } } ```
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