小编Sag*_*gar的帖子

我想等到ajax调用完成并返回值.

function isFileExists(url) {
    var res = false;
    $.ajax({
        type: "GET",
        async: false,
        url: url,
        crossDomain: true,
        dataType: "script",
        success: function () {
            res = true;
        },
        error: function () {
            res = error;
        },
        complete: function () {

        }
    });
    return res; //It is always return false
}

我想返回值"true/error"

请帮我.

ID  UserName    BookType    bookID

1   Krish   1   1
1   Krish   1   2
1   Krish   2   1
1   Krish   2   2
2   Ram     1   1    
3   Raj     1   1
3   Raj     1   2

我有上面的表,我想获得每个用户的独特的booktype计数和bokkID计数,我能够在sqlserver中写这个,但是当我来LINQ无法编写查询时.

我需要以下输出,

ID  UserName    BookType    bookID

1   Krish   2   2
2   Ram     1   1 
3   Raj     1   2