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我试图在没有创建映射它的模型的情况下执行查询。考虑这个片段

public IDictionary<string, int> GetParentelaMapping()
    {
        using (var conn = dataContextFactory.Create())
        {
            var result = conn.Query<dynamic>("SELECT ID_GRADO_PARENTELA,GRADO_PARENTELA FROM GRADO_PARENTELA")
                .ToDictionary(
                    row => (string)row.GRADO_PARENTELA,
                    row => (int)row.ID_GRADO_PARENTELA, StringComparer.OrdinalIgnoreCase);

            return result;
        }
    }

它给了我一个例外，即 Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: ''int' does not contain a definition for 'GRADO_PARENTELA''

我该如何处理这种情况？谢谢

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1 回答 1

1

不幸的是，目前不支持此功能。为此跟踪新问题 #1591。

作为一种解决方法，我建议定义额外的类来读取这样的结果：

class ParentelaMapping
{
    public int ID_GRADO_PARENTELA { get; set; }
    pulbic string GRADO_PARENTELA { get; set; }
}

public IDictionary<string, int> GetParentelaMapping()
{
    using (var conn = dataContextFactory.Create())
    {
        var result = conn.Query<ParentelaMapping>("SELECT ID_GRADO_PARENTELA,GRADO_PARENTELA FROM GRADO_PARENTELA")
            .ToDictionary(
                row => row.GRADO_PARENTELA,
                row => row.ID_GRADO_PARENTELA, StringComparer.OrdinalIgnoreCase);

        return result;
    }
}

附言

linq2db旨在更好地处理 linq 查询，因此请考虑以下列方式重写您的查询：

[Table("GRADO_PARENTELA")]
class GrandoParentela
{
    public int ID_GRADO_PARENTELA { get; set; }
    pulbic string GRADO_PARENTELA { get; set; }
}

public IDictionary<string, int> GetParentelaMapping()
{
    using (var conn = dataContextFactory.Create())
    {
        var result = conn.GetTable<GrandoParentela>()
            .ToDictionary(
                row => row.GRADO_PARENTELA,
                row => row.ID_GRADO_PARENTELA, StringComparer.OrdinalIgnoreCase);

        return result;
    }
}
于 2019-02-05T13:58:05.990 回答