Question

我需要将包含数组的对象模型序列化为查询字符串，我有以下代码：

       public static string ToQueryString(this object query)
    {
        var result = new List<string>();
        var properties = query.GetType().GetProperties().Where(p => p.GetValue(query, null) != null && p.GetValue(query, null).ToString() != "0");

        foreach (var p in properties)
        {
            var value = p.GetValue(query, null);
            var collection = value as ICollection;
            if (collection != null)
            {
                result.AddRange(from object o in collection select string.Format("{0}={1}", p.Name, HttpUtility.UrlEncode(o.ToString())));
            }
            else
            {
                result.Add($"{p.Name}={HttpUtility.UrlEncode(value.ToString())}");
            }
        }

        return string.Join("&", result.ToArray());
    }

以及以下示例模型：

        var model = new exampleModel()
        {
            OrderBy = "name",
            OrderByDesc = true,
            PersonName= "John",
            Languages = new string[] { "French", "English", "Spanish" }
        };

当序列化模型时，查询字符串的转换如下：

＆＃34;排序依据=名＆安培; OrderByDesc =真安培; PERSONNAME =约翰＆安培;语言=法语＆安培;语言=英语＆安培;语言=西班牙语＆＃34;

正如您所看到的那样，这是不可取的，因为该属性＆＃34;语言＆＃34;在查询字符串中为集合中的每个值重复。有谁知道如何设法获取查询字符串，如：

＆＃34;排序依据=名＆安培; OrderByDesc =真安培; PERSONNAME =约翰＆安培;语言=法语，英语，西班牙语＆＃34;

Answer 1

将ICollection的处理方式更改为您希望的格式：

  public static string ToQueryString(this object query)
{
    var result = new List<string>();
    var properties = query.GetType().GetProperties().Where(p => p.GetValue(query, null) != null && p.GetValue(query, null).ToString() != "0");

    foreach (var p in properties)
    {
        var value = p.GetValue(query, null);
        var collection = value as ICollection;
        if (collection != null)
        {
            result.Add(p.Name+"="+string.Join(",", collection.Select(o => HttpUtility.UrlEncode(o.ToString())).ToArray());
        }
        else
        {
            result.Add($"{p.Name}={HttpUtility.UrlEncode(value.ToString())}");
        }
    }

    return string.Join("&", result.ToArray());
}

Answer 2

检查属性值是否为数组，并且由于数组实现IEnumerable，您可以创建一个通用函数，如下所示：

public string ConvertToQueryString(object obj)
{
    var properties = from p in obj.GetType().GetProperties()
                 where p.GetValue(obj, null) != null
                 select p.Name + "=" + (
                     p.GetValue(obj, null).GetType().IsArray ?
                     string.Join(",", ((IEnumerable)p.GetValue(obj, null)).Cast<object>().Select(x => x.ToString()).ToArray()) :
                     p.GetValue(obj, null).ToString() 
                     );

    return string.Join("&", properties.ToArray());
}

如何将数组序列化为查询字符串？

2 个答案: