我承认我是使用 HTTP POST 的新手……但我认为我已经正确发送了 HTTP POST 请求,在我的远程 Web 端函数中处理了它并返回了响应。
我的 Webside 函数生成如下响应:
DataTable _table = new DataTable("responseValues");
DataColumn ColumnToken = new DataColumn("token", typeof(string));_table.Columns.Add(ColumnToken);
DataColumn ColumnMessage = new DataColumn("message", typeof(string)); _table.Columns.Add(ColumnMessage);
DataRow newRow = _table.NewRow();
newRow["token"] = _token;
newRow["message"] = responseMessage.ToString();
_table.Rows.Add(newRow);
//Create a new response object to return to the HTTPPost request
HttpResponseMessage response = new System.Net.Http.HttpResponseMessage(System.Net.HttpStatusCode.OK);
//Populate .Content with json formatted data
// use system.net.http.Json
JsonSerializerOptions _JsonSerializerOptions = new JsonSerializerOptions();
_JsonSerializerOptions.PropertyNameCaseInsensitive = true;
_JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
response.Content = JsonContent.Create(inputValue: _table,
options: _JsonSerializerOptions,
mediaType: new MediaTypeHeaderValue("application/json"));
响应内容如下所示。我已经爆炸了,所以我可以理解它:
{
"version":"1.1",
"content":
{
"objectType":"System.Data.DataTable,
System.Data.Common,
Version=4.2.2.0,
Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a",
"value":
[
{
"token":"3669a2a1d397e83bcda5",
"message":"CONNECTION STATE = OpenSUCCESS. Token Created."
}
],
"headers":
[
{
"key":"Content-Type",
value":
[
"application/json"
]
}
]
},
"statusCode":200,
"reasonPhrase":"OK",
"headers":[],
"trailingHeaders":[],
"requestMessage":null,
"isSuccessStatusCode":true
}
我的问题是我无法提取(反序列化)已序列化到其中的数据表。 根据我的尝试,我得到了 2 个不同的结果: 如果我试试这个:
_JsonSerializerOptions.PropertyNameCaseInsensitive = True
_JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase
Dim Rslt As DataTable = Await _Login_postResponse.Content.ReadFromJsonAsync(type:=GetType(System.Data.DataTable), options:=_JsonSerializerOptions)
Rslt 成为一个没有错误的空数据表。
但是如果我试试这个
Dim strRslt = Await _Login_postResponse.Content.ReadAsStringAsync
Dim Rslt As DataTable = Newtonsoft.Json.JsonConvert.DeserializeObject(Of DataTable)(strRslt)
我收到此错误:
<块引用>读取数据表时出现意外的 JSON 标记。预期的 StartArray,得到 起始对象。路径 '',第 1 行,位置 1。
我已查看此帖子:StackOverflow 并尝试在响应中发回数据集:
结果是这个 response.content:
DataSet _dset = new DataSet();
DataTable _table = new DataTable("responseValues");
DataColumn ColumnToken = new DataColumn("token", typeof(string));_table.Columns.Add(ColumnToken);
DataColumn ColumnMessage = new DataColumn("message", typeof(string)); _table.Columns.Add(ColumnMessage);
DataRow newRow = _table.NewRow();
newRow["token"] = _token;
newRow["message"] = responseMessage.ToString();
_table.Rows.Add(newRow);
_dset.Tables.Add(_table);
//Create a new response object to return to the HTTPPost request
HttpResponseMessage response = new System.Net.Http.HttpResponseMessage(System.Net.HttpStatusCode.OK);
//Populate .Content with json formatted data
// use system.net.http.Json
JsonSerializerOptions _JsonSerializerOptions = new JsonSerializerOptions();
_JsonSerializerOptions.PropertyNameCaseInsensitive = true;
_JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
response.Content = JsonContent.Create(inputValue: _dset,
options: _JsonSerializerOptions,
mediaType: new MediaTypeHeaderValue("application/json"));
{
"version":"1.1",
"content":
{
"objectType":"System.Data.DataSet,
System.Data.Common,
Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a",
"value":
{
"responseValues":
[
{
"token":"64b2818c1b2d9d09eb42",
"message":"CONNECTION STATE = OpenSUCCESS. Token Created."
}
]
},
"headers":
[
{
"key":"Content-Type",
"value":
[
"application/json"
]
}
]
},
"statusCode":200,
"reasonPhrase":"OK",
"headers":[],
"trailingHeaders":[],
"requestMessage":null,
"isSuccessStatusCode":true
}
如果我使用这种方法反序列化:
Dim strRslt = Await _Login_postResponse.Content.ReadAsStringAsync
Dim Rslt As DataTable = Newtonsoft.Json.JsonConvert.DeserializeObject(Of DataTable)(strRslt)
我收到此错误:
<块引用>读取数据表时出现意外的 JSON 标记。预期的 StartArray,得到 String。路径“版本”,第 1 行,位置 16。
这个方法返回一个空数据集
Dim Rslt As DataSet = Await _Login_postResponse.Content.ReadFromJsonAsync(type:=GetType(System.Data.DataSet), options:=_JsonSerializerOptions)
我做错了什么?