.Net Core 2.2 绑定 - 模型属性为空答案

【问题标题】：.Net Core 2.2 binding - model properties are null.Net Core 2.2 绑定 - 模型属性为空
【发布时间】：2020-07-30 14:31:28
【问题描述】：

我尝试将我的 Json 绑定到的模型：

public class UserText
{
    public string Title { get; set; }
    public string Description { get; set; }
    public string Content { get; set; }
    public string MainImageStr { get; set; }
    public List<int> CategoriesIds { get; set; }
    public List<string> LocationStrList { get; set; }
}

public class AdminText : UserText
{
    
    public int Type { get; set; }
    public string KeyWords { get; set; }
    public string HomepageTitle { get; set; }
    public string HomepageDescription { get; set; }
    public string TitleAltOfImage { get; set; }
    public bool IsHomePageText { get; set; } = false;
    public int HomepageOrder { get; set; }
    public bool EnableComments { get; set; } = true;
    public bool IsMultiLanguage { get; set; } = false;
    public short LanguageType { get; set; }
    public int Status { get; set; }
}

JSON：

{
    "LocationStrList": "7_110",
    "CategoriesIds": "33",
    "TitleAltOfImage": "asdasdasdasdasdasdssss",
    "KeyWords": "asdasdasdasdasdasdssss",
    "EnableComments": "false",
    "Type": "2",
    "LanguageType": "1",
    "Status": "1",
    "IsHomePageText": "false",
    "HomepageTitle": "asdasdasdasdasdasdssss",
    "HomepageDescription": "asdasdasdasdasdasdssss",
    "HomepageOrder": "2",
    "IsMultiLanguage": "false"
}

Mvc 控制器动作签名：

public async Task<JsonResult> AddText(AdminText newText)

模型的每个属性都是空的，这是为什么呢？

【问题讨论】：

标签： c# asp.net-mvc asp.net-core .net-core

【解决方案1】：

CategoriesIds 和 LocationStrList 字段属于列表类型，您需要将这两个字段的值作为数组传递..

{
    "LocationStrList": ["7_110"],
    "CategoriesIds": ["33"],
    "TitleAltOfImage": "asdasdasdasdasdasdssss",
    "KeyWords": "asdasdasdasdasdasdssss",
    "EnableComments": "false",
    "Type": "2",
    "LanguageType": "1",
    "Status": "1",
    "IsHomePageText": "false",
    "HomepageTitle": "asdasdasdasdasdasdssss",
    "HomepageDescription": "asdasdasdasdasdasdssss",
    "HomepageOrder": "2",
    "IsMultiLanguage": "false"
}

【讨论】：

【解决方案2】：

你的List,int,bool的数据类型是你json中的字符串。所以你需要改变json中的数据类型。而在mvc中，如果你想将json数据传递给控制器，你需要使用[From Body].这里是一个演示：控制器：

[HttpPost]
        public async Task<JsonResult> AddText([FromBody]AdminText newText) {
            return Json("ok");
        }

JsonData：

{"LocationStrList": ["7_110"],
    "CategoriesIds": [33],
    "TitleAltOfImage": "asdasdasdasdasdasdssss",
    "KeyWords": "asdasdasdasdasdasdssss",
    "EnableComments": false,
    "Type": 2,
    "LanguageType": 1,
    "Status": 1,
    "IsHomePageText": false,
    "HomepageTitle": "asdasdasdasdasdasdssss",
    "HomepageDescription": "asdasdasdasdasdasdssss",
    "HomepageOrder": 2,
    "IsMultiLanguage": false
}

结果：

【讨论】：