從字符串到類型'double'的轉換在LINQ查詢中無效

Question

在下面的Linq查詢中，我從字符串轉換為“ double”類型錯誤：

 Dim query = From Corrections In Test _
             Where Not Corrections.Expected_Bill = Corrections.Bill _
             Select Corrections.Account, _
             Corrections.Site, _
             Action = If(Corrections.Bill = "No billing PLI", _
                          +"This site has no billing PLI set up; " _
                          + "please add " + Corrections.Expected_Bill, _
                          +"This site has an incorrect billing PLI set up; " _
                          + "please remove " + Corrections.Bill + " and " _
                          + "add " + Corrections.Expected_Bill)

看起來查詢的'If（Corrections.Bill =“ No billing PLI”“部分是引發異常的部分，但是鑒於所有字段均為文本，因此我不明白為什么會發生這種情況。

Answer 1

逗號后有一個多余的+ 。 更換

+"This site has an incorrect billing PLI set up; " _

與

"This site has an incorrect billing PLI set up; " _