我是 LINQ 新手，请帮助我将这行嵌套代码转换为 LINQ。
foreach(var rule in rules)
{
foreach(var package in packages)
{
if(rule.KeyFrom == package.Key || rule.KeyTo == package.Key)
{
filteredRule.Add(new RuleModel{Package = new List<string>{rule.KeyTo, rule.KeyFrom}, Rule = rule.Rule});
}
}
}
尝试查询：
rules.SelectMany(r => packages.Select(p => p.Key == r.KeyFrom || p.Key == r.KeyTo))
.Select(new RuleModel {
Package = new List<string>{ r.Keyfrom, r.KeyTo},
Rule = r.Rule
}));
你快到了。你的问题是在SelectMany你用过Select用于过滤而不是使用Where:
rules.SelectMany(r => packages.Where(p => p.Key == r.KeyFrom || p.Key == r.KeyTo))
.Select(r => new RuleModel {
Package = new List<string>{ r.Keyfrom, r.KeyTo},
Rule = r.Rule
}));
-
Where https://msdn.microsoft.com/en-us/library/bb549418(v=vs.110).aspx - 根据谓词过滤值序列
-
Select https://msdn.microsoft.com/en-us/library/bb548891(v=vs.110).aspx - 将序列的每个元素投影为新形式
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