反序列化JSON并分配给模型 [英] Deserialize JSON and assign to model

问题描述

作为我的Web API的一部分，我得到了以下JSON.

As part of my web api, I'm getting the following JSON returned.

["{\"InputType\":17,\"EngineSubType\":4,\"Filename\":\"targetFile.csv\",\"FileExtensionType\":\".csv\",\"IsLoadFile\":true,\"LoadContextId\":4121,\"ReportingDate\":\"2019-05-31T00:00:00\",\"IsSuccess\":false}"]

我想做的就是获取Filename旁边的值，并将其分配给我的模型Filename参数.

What I'm wanting to do is grab the value next to Filenameand assign it to my models Filename parameter.

在我的项目中，我创建了一个单元测试来尝试获取该值，但是我所做的每一次尝试都失败了.

In my project I've created a unit test to experiment with grabbing that value, but each attempt I've making is failing.

在我的测试中，我具有以下DTO模型:

In my test I have following DTO Model:

public class HangfireTestDTO
{
    public string InputType { get; set; }
    public string Filename { get; set; }
}

然后我的文字逻辑是这样的:

Then my text logic is this:

[Fact]
public void TestDTO()
{
    string data =
          "[\"{\\\"InputType\\\":12,\\\"EngineSubType\\\":2,\\\"Filename\\\":\\\"targetFile.csv\\\",\\\"FileExtensionType\\\":\\\".csv\\\",\\\"IsLoadFile\\\":true,\\\"LoadContextId\\\":4120,\\\"ReportingDate\\\":\\\"2019-05-31T00:00:00\\\",\\\"IsSuccess\\\":false}\"]";

     // fails here
     var arguments = System.Text.Json.JsonSerializer.Deserialize<HangfireTestDTO>(data);

     // This is wrong - ignore for now
     Assert.Equal("targetFile.csv", arguments.ToString());

}

当我在测试中调试以上内容时，它会告诉我以下内容:

When I debug the above in my test it tells me the following:

JSON值无法转换为MyProject.HangfireTestDTO

The JSON value could not be converted to MyProject.HangfireTestDTO

然后我的想法使我通过将反序列化行修改为以下内容来再次尝试:

My thinking then led me to try again by modifying the deserialize line to the following:

 var arguments = System.Text.Json.JsonSerializer.Deserialize<IEnumerable<HangfireTestDTO>>(data).FirstOrDefault();

但是用新行运行它时，出现以下错误:

But when running it with the new line, I get the following error:

JSON值无法转换为System.Collections.Generic.List

The JSON value could not be converted to System.Collections.Generic.List

我做错了什么?

推荐答案

第一个错误是由于InputType引起的.应该是int

The first error is because of InputType. It should be int

public class HangfireTestDTO
{
    public int InputType { get; set; }
    public string Filename { get; set; }
}

第二个错误是由于JSON.在[和{之间有一个引号.我已经尝试了以下JSON，并且有效.由于此报价，它变为List<string>而不是List<HangfireTestDTO>

The second error is because of JSON. There is an addition quotation between [ and {. I have tried with below JSON and it worked. Because of this quotation it becomes List<string> and not List<HangfireTestDTO>

[
    {
        "InputType": 12,
        "EngineSubType": 2,
        "Filename": "targetFile.csv",
        "FileExtensionType": ".csv",
        "IsLoadFile": true,
        "LoadContextId": 4120,
        "ReportingDate": "2019-05-31T00:00:00",
        "IsSuccess": false
    }
]

然后查看JSON应该是IEnumerable<HangfireTestDTO>

var arguments = JsonSerializer.Deserialize<IEnumerable<HangfireTestDTO>>(data);

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