C# 如果您的数据表的主键是两列，您可以使用 DataTable.Contains(object key) 吗？
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Can you use DataTable.Contains(object key) if your datatable's primary key is two columns?
提问by Slim
if so how?
如果是这样怎么办？
采纳答案by van
To select by a primary key you should use one of:
要通过主键进行选择，您应该使用以下选项之一：
DataTable.Rows.Find(Object)in case your PK is one columnDataTable.Rows.Find(Object[])in case you have more then 1 column as a primary key
DataTable.Rows.Find(Object)如果你的 PK 是一列DataTable.Rows.Find(Object[])如果您有超过 1 列作为主键
In case of a typed DataSet, the method MyDataTable.Rows.Find(...)will be generated for you with the proper signature. Basically it is a method on DataRowCollection class
如果是类型化的 DataSet，MyDataTable.Rows.Find(...)将使用正确的签名为您生成该方法。基本上它是 DataRowCollection 类上的一个方法
回答by Clyde
'Contains' does not seem to be a member of the DataRow class (maybe this is a typed data set?)
“包含”似乎不是 DataRow 类的成员（也许这是一个类型化数据集？）
In any case, you can always use (DataTable.Select(....).Length > 0) as a substitute
在任何情况下，您始终可以使用 (DataTable.Select(....).Length > 0) 作为替代
回答by Thomas Levesque
I assume you're referring to the DataRowCollection.Contains method ? There is an overload that takes an array of objects, you should use this one
我假设您指的是 DataRowCollection.Contains 方法？有一个需要一组对象的重载，你应该使用这个
