C# 从JSON响应中检索元素

我试图从我们正在构建的Web API中的rest服务的响应中获取一个字段。JSON如下所示：

{
"d": {
    "results": [{
        "__metadata": {
            "id": "Web/Lists(guid'4ddc-41e2-bb44-0f92ad2c0b07')/Items(164)",
            "uri": "https://teams.ax.org/sites/js/project/_api/Web/Lists(guid'4ddc-41e2-bb44-0f92ad2c0b07')/Items(164)",
            "etag": "\"6\"",
            "type": "SP.Data.St_x0020_CdsListItem"
        },
        "Folder": {
            "__deferred": {
                "uri": "https://teams.ax.org/sites/js/project/_api/Web/Lists(guid'4ddc-41e2-bb44-0f92ad2c0b07')/Items(164)/Folder"
            }
        },
        "ParentList": {
            "__deferred": {
                "uri": "https://teams.ax.org/sites/js/project/_api/Web/Lists(guid'4ddc-41e2-bb44-0f92ad2c0b07')/Items(164)/ParentList"
            }
        },
        "PM_x0020_NameId": 220,
        "St_x0020_Name": "<div class=\"ExternalClassA14DB0FF86994403B827D91158CF34B0\">KO</div>",
    }]
}}

我在

GetfromSharepoint

方法中反序列化JSON，如下所示

using (var client_sharePoint = new HttpClient(handler))
{
    var response = client_sharePoint.GetAsync(SP_URL).Result;

    var responsedata = await response.Content.ReadAsStringAsync();
    var returnObj = JsonConvert.DeserializeObject<SharepointDTO.RootObject>(responsedata);

    return returnObj;
}

使用（var-client\u-sharePoint=new-HttpClient（handler））
{
var response=client\u sharePoint.GetAsync（SP\u URL）.Result；
var responsedata=await response.Content.ReadAsStringAsync（）；
var returnObj=JsonConvert.DeserializeObject（responsedata）；
返回OBJ；
}

但它抛出了一个错误：

“System.Collections.Generic.IList”不包含“St_x0020_Name”的定义，并且找不到接受“System.Collections.Generic.IList”类型的第一个参数的扩展方法“St_x0020_Name”（是否缺少using指令或程序集引用？）

这句话是不是应该：

string StName = retSharepointobj.d.results.St_x0020_Name.ToString();

是这样吗

string StName = retSharepointobj.d.results.First().St_x0020_Name.ToString();

---

results

是一个数组，因此您可以使用

foreach(var item in retSharepointobj.d.results){
   string StName = item.St_x0020_Name.ToString();
}

或者获取特定元素，例如第一个元素，如：

SharepointDTO.RootObject retSharepointobj = await GetfromSharepoint(StNumber);
string StName = retSharepointobj.d.results[0].St_x0020_Name.ToString();

或者你可以加一张这样的支票

SharepointDTO.RootObject retSharepointobj = await GetfromSharepoint(StNumber);
if(retSharepointobj.d.results.length > 0){
    string StName = retSharepointobj.d.results[0].St_x0020_Name.ToString();
}

---

但是我将整个

KO

放入字符串中，如何仅获取div标记之间的

KO

。但是我将整个KO放入字符串中，如何仅获取div标记之间的KO。这是一个不同的问题。您可能希望看到以下内容：

SharepointDTO.RootObject retSharepointobj = await GetfromSharepoint(StNumber);
string StName = retSharepointobj.d.results[0].St_x0020_Name.ToString();

SharepointDTO.RootObject retSharepointobj = await GetfromSharepoint(StNumber);
if(retSharepointobj.d.results.length > 0){
    string StName = retSharepointobj.d.results[0].St_x0020_Name.ToString();
}