摘要: Covariance and Contravariance (C#) https://docs.microsoft.com/en-us/dotnet/articles/csharp/programming-guide/concepts/covariance-contravariance/ In C# 阅读全文
posted @ 2015-01-13 14:09 ChuckLu 阅读(460) 评论(0) 推荐(0) 编辑
摘要: 未处理System.InvalidCastException HResult=-2147467262 Message=无法将类型为“Microsoft.Office.Interop.Excel.ApplicationClass”的 COM 对象强制转换为接口类型“Microsoft.Office... 阅读全文
posted @ 2015-01-13 10:09 ChuckLu 阅读(1672) 评论(0) 推荐(0) 编辑