c# - SQLKata 动态 Where 子句

Question

我正在使用 SQLKata 在 C# 中构建一个 SQL 语句，发现 Github 论坛上发布了一些代码，但它无法编译。我需要帮助才能编译它。

我在 query.Where(q =>

这行收到两个错误

Compilation error (line 17, col 16): Not all code paths return a value in lambda expression of type 'System.Func'

Compilation error (line 17, col 16): Cannot convert lambda expression to type 'object' because it is not a delegate type

class Group
{
   public List<Condition> Conditions {get; set;}
}

class Condition
{
   public string Field {get; set;}
   public string Operator {get; set;} 
   public object Value {get; set;}  
}

var query = new Query("Countries");

foreach(Group group in groups) 
{
    query.Where(q =>
    {
        foreach(Condition c in group.Conditions)
        {
            q.OrWhere(c.Field, c.Operator, c.Value);
        }
    });
}

.NET Fiddle 是 here

Github 帖子 here

更新我已经根据亚历克斯的回答更新了 fiddle 。我正在寻找一个子句，所以预期的输出是用括号括起来的 OR 语句。它现在主要按预期工作除了每个组都应该在它自己的parens内，如下所示:

SELECT * FROM [Countries] WHERE ([Group1Field1] = @p0 OR [Group1Field2] > @p1 OR [Group1Field3] < @p2 OR [Group1Field4] = @p3) OR ([Group2Field1] = @p4 OR [Group2Field2] >= @p5 OR [Group2Field3] <= @p6) AND [Id] = @p7

最终更新弄清楚了。给出上述预期输出。谢谢。

var query = new Query("Countries");

    foreach (Group group in groups)
    {
        query.OrWhere(q => {
        foreach (Condition c in group.Conditions)
        {
            q.OrWhere(c.Field, c.Operator, c.Value);
        }
        return q;

        });

    }
query.Where("Id", "=", 10);

Answer 1

我已更新代码以修复错误。

var query = new Query("Countries");

foreach (Group group in groups)
{
    query.OrWhere(q => {
    foreach (Condition c in group.Conditions)
    {
        q.OrWhere(c.Field, c.Operator, c.Value);
    }
    return q;

    });

}
query.Where("Id", "=", 10);