泛型方法和匿名类型

Question

是否可以创建这样的代码:

private static string GetInsertString<TDto>()
{
    var type = typeof(TDto);
    var properties = type.GetProperties().Where(Where);
    var tableName = type.Name;

    return string.Format("INSERT INTO {0} ({1}) VALUES ({2});", 
    tableName, 
    string.Join(",", properties.Select(x => x.Name).ToArray()),
    string.Join(",", properties.Select(x => string.Format("@{0}", x.Name.ToLower())).ToArray()));
}

适用于这样的匿名类型:

var point = new { X = 13, Y = 7 };

PS:

输出将是:

INSERT INTO Anonymous (X, Y) values (13, 7)

当然你可能想提供表名.

Answer 1

假设您使用 .net 4.0 或更高版本，您可以使用动态，ExpandoObject如下所示：

private static string GetInsertString(dynamic obj)
{
    var expando = (ExpandoObject)obj;

    return string.Format("INSERT INTO {0} ({1}) VALUES ({2});",
        "tableName",
        string.Join(",", expando.Select(x => x.Key)),
        string.Join(",", expando.Select(x => x.Value is string ? "'" + x.Value + "'" : x.Value.ToString())));
}

进而：

dynamic o = new ExpandoObject();

o.a = 10;
o.b = "hello";

var s = GetInsertString(o);

现在s是INSERT INTO tableName (a,b) VALUES (10,'hello');。这只是一个草稿，您需要做一些工作才能获得正确的insert字符串。