如何从动态对象中检索值（简洁的结果）

Question

我正在使用 Dapper multimap 功能并将值映射到各种模型。我正在努力解决如何将映射的值分配给对象的问题。我知道 lambda 函数正在循环遍历行，并且我能够看到简洁对象中的值，但是当我去分配值时，我无法从中获取值：

var certificationReviews = await connection.QueryAsync<ARMS_API.Models.CertificationReview>("select * from dbo.A2F_DMCP_0005_BrowseTest()", 
    types: new[] { 
        typeof(ARMS_API.Models.CertificationReview), 
        typeof(State), 
        typeof(ARMS_API.Models.Program), 
        typeof(ActuarialFirm), 
        typeof(object), 
        typeof(object), 
        typeof(object) , 
        typeof(object)
    }, map: (objects) => {
        var certificationReview = (ARMS_API.Models.CertificationReview)objects[0];
        certificationReview.STATE = (State)objects[1];
        certificationReview.STATE.PROGRAMS.Add((ARMS_API.Models.Program)objects[2]);
        certificationReview.ACTUARIAL_FIRM = (ActuarialFirm)objects[3];
        certificationReview.ACTUARIAL_FIRM.CERTIFYING_ACTUARY.Add(
            new User {
                INTERNAL_USER_NUMBER = (int?)(object)objects[4].GetType().GetProperty("CERTIFYING_ACTUARY_ID"),
                FIRST_NAME = (string?)(Object)objects[4].GetType().GetProperty("CERTIFYING_ACTUARY_FIRST_NAME"),
                LAST_NAME = (string?)(Object)objects[4].GetType().GetProperty("CERTIFYING_ACTUARY_LAST_NAME")
            });
        certificationReview.PRIMARY_REVIEWER = 
            new User {
                INTERNAL_USER_NUMBER = (int?)(object)objects[4].GetType().GetProperty("PRIMARY_ACTUARY_ID"),
                FIRST_NAME = (string?)(Object)objects[4].GetType().GetProperty("PRIMARY_ACTUARY_FIRST_NAME"),
                LAST_NAME = (string?)(Object)objects[4].GetType().GetProperty("PRIMARY_ACTUARY_LAST_NAME")
            };
        certificationReview.SECONDARY_REVIEWER = 
            new User {
                INTERNAL_USER_NUMBER = (int?)(object)objects[4].GetType().GetProperty("SECONDARY_ACTUARY_ID"),
                FIRST_NAME = (string?)(Object)objects[4].GetType().GetProperty("SECONDARY_ACTUARY_FIRST_NAME"),
                LAST_NAME = (string?)(Object)objects[4].GetType().GetProperty("SECONDARY_ACTUARY_LAST_NAME")
            };
        certificationReview.DMCP_ANALYST = 
            new User {
                INTERNAL_USER_NUMBER = (int?)(object)objects[4].GetType().GetProperty("DMCP_ANALYST_ID"),
                FIRST_NAME = (string?)(Object)objects[4].GetType().GetProperty("DMCP_ANALYST_FIRST_NAME"),
                LAST_NAME = (string?)(Object)objects[4].GetType().GetProperty("DMCP_ANALYST_LAST_NAME")
            };
        return certificationReview;
    },
    splitOn: "STATE_ID,PROGRAM_DD,ACTUARIAL_FIRM_DD,CERTIFYING_ACTUARY_ID,PRIMARY_ACTUARY_ID,SECONDARY_ACTUARY_ID,DMCP_ANALYST_ID");
        return (IEnumerable<CertificationReview>)certificationReviews;
    }        
}

当代码到达时就对了

(int?)(object)objects[4].GetType().GetProperty("CERTIFYING_ACTUARY_ID"),

我将鼠标悬停在对象[4]上，我可以看到该对象包含我尝试从中提取的所有字段，例如“CERTIFYING_ACTUARY_ID”，但我不知道如何提取该值。我尝试了 .GetType().GetProperty("CERTIFYING_ACTUARY_ID") 如here所示，但是除了添加 GetValue 等之外什么也没做，而且它们都没有提取我在对象中看到的值，因此结果为 null。我还必须进行显式类型转换，否则会出现空错误。不知道如何获取值！

Answer 1

您并没有利用 Dapper 的映射功能，而是试图将一些复杂、难以维护的代码混合到其中。使用动态代替对象，让 Dapper 完成映射工作。解决方案是这样的：

string sql = "select * from dbo.A2F_DMCP_0005_BrowseTest()";
var certificationReviews = await connection.QueryAsync<ARMS_API.Models.CertificationReview, State, ARMS_API.Models.Program, ActuarialFirm, dynamic, dynamic, dynamic, dynamic>(sql, 
    map: (certificationReview, state, program, firm, user1, user2, user3, user4) => {
        certificationReview.STATE = state;
        certificationReview.STATE.PROGRAMS.Add(program);
        certificationReview.ACTUARIAL_FIRM = firm;
        certificationReview.ACTUARIAL_FIRM.CERTIFYING_ACTUARY.Add(
            new User {
                INTERNAL_USER_NUMBER = user1.CERTIFYING_ACTUARY_ID,
                FIRST_NAME = user1.CERTIFYING_ACTUARY_FIRST_NAME,
                LAST_NAME = user1.CERTIFYING_ACTUARY_LAST_NAME
            });
        certificationReview.PRIMARY_REVIEWER = 
            new User {
                INTERNAL_USER_NUMBER = user2.PRIMARY_ACTUARY_ID,
                FIRST_NAME = user2.PRIMARY_ACTUARY_FIRST_NAME,
                LAST_NAME = user2.PRIMARY_ACTUARY_LAST_NAME
            };
        certificationReview.SECONDARY_REVIEWER = 
            new User {
                INTERNAL_USER_NUMBER = user3.SECONDARY_ACTUARY_ID,
                FIRST_NAME = user3.SECONDARY_ACTUARY_FIRST_NAME,
                LAST_NAME = user3.SECONDARY_ACTUARY_LAST_NAME
            };
        certificationReview.DMCP_ANALYST = 
            new User {
                INTERNAL_USER_NUMBER = user4.DMCP_ANALYST_ID,
                FIRST_NAME = user4.DMCP_ANALYST_FIRST_NAME,
                LAST_NAME = user4.DMCP_ANALYST_LAST_NAME
            };
        return certificationReview;
    },
    splitOn: "STATE_ID,PROGRAM_DD,ACTUARIAL_FIRM_DD,CERTIFYING_ACTUARY_ID,PRIMARY_ACTUARY_ID,SECONDARY_ACTUARY_ID,DMCP_ANALYST_ID"
    );
    return (IEnumerable<CertificationReview>)certificationReviews;
    }        
}

这可能不会按您期望的方式工作，您只会在您调用

.Add

的地方获得一件物品。如果这不是您想要的，您需要查看在 Dapper 中使用连接的技术。 我更喜欢一个没有动态的解决方案，将每个用户映射到它自己的类，扩展

User

。