Solve the problem of linq return value being empty or forcing the type to be null

Little scum · Posted on 5/9/2015 6:27:11 PM

Today, the egg hurt all afternoon, and the data obtained was anonymously loaded with var.

Then force type conversion, it becomes null, I have been writing a forced type conversion wrong,

Finally, I found some information from the Internet, and finally came out, var type to list type requires toList(), what a trick! !

Correct writing:

var hh = (from f in db.ClassInfo select f).ToList();
List<ClassInfo> g = hh as List<ClassInfo>;
GridView1.DataSource = g;
GridView1.DataBind();

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public static List<shopinfoview> GetShopInfo() {
ShopDBDataContext db = new ShopDBDataContext();
return (from b in db.shopinfoview select b).ToList();
}

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The knife is flying · Posted on 5/9/2015 8:45:03 PM

learned.

[Communication] Solve the problem of linq return value being empty or forcing the type to be null

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