MVC 自定义IModelBinder实现json参数转Dictionary<string, string> - 逆心

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一、原始json转Dictionary<string, string>

如果不用IModelBinder,那么将Json字符串转换为Dictionary<string, string>的代码写法是:

    /// <summary>
    /// 手动Json转Dictionary
    /// </summary>
    /// <param name="Param"></param>
    /// <returns></returns>
    public ActionResult ManualJsonToDictionary(string Param)
    {
        JavaScriptSerializer jss = new JavaScriptSerializer();
        //将Json字符串转换为Dictionary<string, string>
        Dictionary<string, string> DicParam = jss.Deserialize<Dictionary<string, string>>(Param);
        return Content(DicParam["Title"]);
    }

当这个需求多了之后,这种代码就太多了,可以通过实现IModelBinder来简化。

二、实现IModelBinder简化

简化后的代码如下:

    /// <summary>
    /// 测试IModelBinder接口的实现
    /// </summary>
    /// <param name="DicParam"></param>
    /// <returns></returns>
    public ActionResult TestJsonToDictionary([ModelBinder(typeof(JsonToDictionaryBinder))]Dictionary<string, string> DicParam)
    {
        return Content(DicParam["Title"]);
    }

其中实现IMidelBinder的类JsonToDictionaryBinder的代码如下:

    /// <summary>
    /// Json转Dictionary<string, string>
    /// </summary>
    public class JsonToDictionaryBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            Dictionary<string, string> DicParam = new Dictionary<string, string>();
            if (!string.IsNullOrEmpty(Convert.ToString(controllerContext.HttpContext.Request["Param"])))
            {
                System.Web.Script.Serialization.JavaScriptSerializer sr = new System.Web.Script.Serialization.JavaScriptSerializer();
                DicParam = sr.Deserialize(controllerContext.HttpContext.Request["Param"], typeof(Dictionary<string, string>)) as Dictionary<string, string>;
            }
            return DicParam;
        }
    }

前台测试页面代码如下:

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script src="/jquery-1.10.2.min.js"></script>
    <script type="text/javascript">
    $(function(){
        var jsonStr = "{\"Id\":\"1\",\"Title\":\"张飞\"}";
        $.ajax({
        url: "/Home/TestJsonToDictionary",
        dataType: "text",
        data:{
            Param: jsonStr
        },
        success: function (response) {
            alert(response);
        }
    })
     
    $.ajax({
        url: "/Home/ManualJsonToDictionary",
        dataType: "text",
        data: {
            Param: jsonStr
        },
        success: function (response) {
            alert(response);
        }
    })
})
</script>
</head>
<body>
    <div></div>
</body>
</html>