您可以使用的BindingSource的Filter属性做SQL像过滤。 例如：

You can use the Filter property of a BindingSource to do SQL like filtering. For example:

bindingSource.Filter= "Activated = 1"

有什么样的文件之本的确切语法？

我要检查，如果一个字段不是DBNull的，所以我尝试现场！= NULL，但它提供了一个语法错误。

I would like to check if a field is not DBNull, so i tried "Field != NULL" but it gives a syntax error.

推荐答案

语法通常是一样的你会怎么会用在SQL Where子句，没有如果，所以在这种情况下，这将是

The syntax is generally the same as what would you would use in a SQL Where clause, without the "Where", so in this case, it would be

  bindingSource.Filter = "Field <> NULL";

如果你看一下MSDN文档为BindingSource.Filter，你会看到这样的：

If you look at msdn docs for BindingSource.Filter you will see this:

，形成一个过滤器值，指定过滤的列后跟一个运算符和值的名称，接受过滤器语法取决于底层的数据源。如果基础数据源是一个DataSet，DataTable中，或数据视图，您可以指定布尔EX pressions的的使用语法文件的DataColumn..::.Ex$p$pssion属性。的

"To form a filter value, specify the name of a column followed by an operator and a value to filter on. The accepted filter syntax depends on the underlying data source. If the underlying data source is a DataSet, DataTable, or DataView, you can specify Boolean expressions using the syntax documented for the DataColumn..::.Expression property."

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