C# 将foreach和if转换为linq查询

但是它告诉我下面的错误@

l.Key

  SourceSchemaInfos.ForEach(Database =>Database.SchemaInfos.ForEach(items => items.SchemaInfos.ForEach(tables => tables.SchemaInfos.Where(tables.Key == SelectedTables.ForEach(l => l.Key)).ForEach(m => m.IsSelected = true))));

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`请尝试以下代码。我认为这是正确的

LINQ

转换您的查询

CS0201  Only assignment, call, increment, decrement, and new object expressions can be used as a statement

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请尝试以下代码。我认为这是正确的

LINQ

转换您的查询

CS0201  Only assignment, call, increment, decrement, and new object expressions can be used as a statement

 foreach (var _tableschema in 
            (from db in SourceSchemaInfos from table in db.SchemaInfos from tablelist in table.SchemaInfos 
             select tablelist)
            .SelectMany(tablelist => SelectedTables.Where(t => tablelist.Key == t.Key)
                .SelectMany(t => tablelist.SchemaInfos)
                ))
        {
            _tableschema.IsSelected = true;
        }

var schemaInfos = from db in SourceSchemaInfos
                  from table in db.SchemaInfos
                  from tableList in table.SchemaInfos
                  from selectedTable in SelectedTables
                  where tableList.Key == selectedTable.Key
                  select tableList.SchemaInfos;

foreach(var tableSchema in schemaInfos)
{
    tableSchema.IsSelected = true;
}