如何更改DataBound GridView上的标签？

Question

我继承了另一个用vb.net编写的开发人员的应用程序（我仍然不太熟练）。 它包含一个被数据绑定的GridView，它也动态地生成列的标签。 我需要将“学术年”标题更改为例如2009-2010，而不是简单的2010。当前代码设置了该学科的学年，但它似乎也可以控制所显示的数据。

这是代码：

sql_string_Total = sql_string_Total & " sum([" & Academic_year - 4 & "]) as [" & Academic_year - 4 & "],sum([" & Academic_year - 3 & "]) as [" & Academic_year - 3 & "],sum([" & Academic_year - 2 & "]) as [" & Academic_year - 2 & "],sum([" & Academic_year - 1 & "]) as [" & Academic_year - 1 & "],sum([" & Academic_year & "]) as [" & Academic_year & "], "
sql_string_Total = sql_string_Total & " sum([" & Academic_year & "]-[" & Academic_year - 1 & "]) as [" & (Academic_year - 1) & "-" & (Academic_year) & " Diff.], "
sql_string_Total = sql_string_Total & " (cast(((sum([" & Academic_year & "])-sum([" & Academic_year - 1 & "]))/(sum([" & Academic_year - 1 & "])*1.0)*100.0)as numeric(4,1))) as [" & (Academic_year - 1) & "-" & (Academic_year) & " % Change] "

如何在不影响所显示数据的情况下更改这些列的标题？

Answer 1

这似乎更多是SQL-VB问题的混合，而不仅仅是VB问题。 SQL中的as关键字指示该字段将在结果集中具有的名称。 说了这么多...

快速解决方案：只需根据需要更改字段名称。 例如，更改：

sql_string_Total = sql_string_Total & " sum([" & Academic_year - 4 & "]) as [" & Academic_year - 4 & "],sum([" & Academic_year - 3 & "]) as [" & Academic_year - 3 & "],sum([" & Academic_year - 2 & "]) as [" & Academic_year - 2 & "],sum([" & Academic_year - 1 & "]) as [" & Academic_year - 1 & "],sum([" & Academic_year & "]) as [" & Academic_year & "], "

至

sql_string_Total = sql_string_Total & " sum([" & Academic_year - 4 & "]) as [" & Academic_year - 5 & "-" & Academic_year - 4 & "],sum([" & Academic_year - 3 & "]) as [" & Academic_year - 4 & "-" & Academic_year - 3 & "],sum([" & Academic_year - 2 & "]) as [" & Academic_year - 3 & "-" & Academic_year - 2 & "],sum([" & Academic_year - 1 & "]) as [" & Academic_year - 2 & "-" & Academic_year - 1 & "],sum([" & Academic_year & "]) as [" & Academic_year - 1 & "-" & Academic_year & "], "

以前的开发人员对要求和的列和将要具有的名称都使用相同的变量，但是您可以将名称更改为所需的名称，而不会影响要查询的数据。 在gridview中，该列将采用您为结果列指定的名称。

缓慢的推荐解决方案：重写那段代码。 我知道这不是你的，但正如你所看到的，它是一个小怪物，任何编辑都会使它变得更糟。 更不用说这是创建dinamyc sql的非常非常糟糕的方法。 寻找一种重写方式也可以帮助您提高VB.net技能，如果您要在这个项目中待一会儿，我认为您将需要它们。 我建议您先看看String.Format方法和参数化查询 。