将 LINQ except() 与两个不同类型的集合一起使用

发布于 2024-12-11 08:50:18 字数 560 浏览 0 评论 0原文

我无法使用此处的示例，因为它是具体到提问者所使用的结构。

目前，我要去：

PropertyInfo[] props = this.GetType().GetProperties();
foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns)
    if( !props.Any(p => p.Name == dataColumn.ColumnName) )
        ...

我更愿意在一行中写一些东西，例如：

foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns.Cast<DataColumn>.Except(props) )
    ...

有什么想法吗？

原文

I can't use the example here because it's specific to the structure the asker was using.

Currently, I'm going:

PropertyInfo[] props = this.GetType().GetProperties();
foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns)
    if( !props.Any(p => p.Name == dataColumn.ColumnName) )
        ...

I'd much rather have something in one line, such as:

foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns.Cast<DataColumn>.Except(props) )
    ...

Any ideas?

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纸伞微斜 2024-12-18 08:50:18

var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !props.Any(p => p.Name == column.ColumnName);
foreach(DataColumn in columns) 
    ....

或者稍微优化的版本（一如既往，取决于运行时的列数、属性等）：

PropertyInfo[] props = this.GetType().GetProperties();
var lookup = new HashSet<string>(props.Select(x=>x.Name));
var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !lookup.Contains(column.Name));

var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !props.Any(p => p.Name == column.ColumnName);
foreach(DataColumn in columns) 
    ....

Or the slightly optimized version (as always, depending on the runtime number of columns, properties, etc, etc):

PropertyInfo[] props = this.GetType().GetProperties();
var lookup = new HashSet<string>(props.Select(x=>x.Name));
var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !lookup.Contains(column.Name));

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