有的时候使用Dapper执行数据操作时,我们会把模型对象直接作为参数传递进去,
但是需要在注意的是!Dapper解析数据是根据属性进行解析的,如果传递的类中使用字段赋值,就会报错 Parameter '?xxx' must be defined
class AAA { public int ID { get; set; } public string Name { get; set; } } class BBB { public int id; public string name; } void Test() { AAA aaa = new AAA() { ID = 1, Name = "张三", }; var sql1 = "insert into AAA (ID,Name) values (?ID,?Name);"; using (IDbConnection conn = new MySqlConnection(_connString)) { var rs1 = conn.Execute(sql1, aaa); } BBB bbb = new BBB() { //因为种种原因,数据只使用字段赋值 id = 1, name = "张三", }; var sql2 = "insert into BBB (id,name) values (?id,?name);"; using (IDbConnection conn = new MySqlConnection(_connString)) { //这里会报错 Parameter '?id' must be defined,因为dapper时根据属性进行解析的,而BBB里面只有字段 //var rs1 = conn.Execute(sql2, aaa); var rs1 = conn.Execute(sql2, new { bbb.id, bbb.name }); //要么改成属性,要么使用匿名类传递 } }
标签:name,defined,BBB,var,new,Parameter,id,conn,must From: https://www.cnblogs.com/luludongxu/p/18386788