You want to use .DefaultIfEmpty , as per this question. var query = from p in Programs join pl in ProgramLocations on p.ProgramID equals pl. ... <看更多>

I am getting a Null Reference Exception when selecting a column in the left join table. Here is my linq var query1 = from vehicles in ... ... <看更多>

Empty(outer.Join(inner, e => e, e => e, (x, y) => x, EqualityComparer<string>.Default)); }. 這裡我們可以看到 inner 跟 outer 是有一個 null 的字串陣列，可是他 ... ... <看更多>

使用 DefaultIfEmpty ，如果找不到匹配項，傳統的Linq Join 可以返回預設物件。 ... on l equals (int)r into leftJoin from result in leftJoin. ... <看更多>

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