C#构建批量API请求时如何设置Cache-Control请求头

针对你遇到的匿名类型无法定义Cache-Control这类带连字符键的问题，以下是几种可行的解决方案：

方法1：用Dictionary<string, string>替代匿名类型 #

直接将Headers部分替换为字典，字典的键不受C#标识符规则限制，序列化后会直接生成目标JSON格式：

var batchRequest = new
{
    GetEvents = new
    {
        Method = "GET",
        Headers = new Dictionary<string, string>
        {
            { "Cache-Control", "no-cache" }
        },
        Resource = "https://xxxx"
    },
    GetAttributes = new
    {
        Method = "GET",
        ParentIDs = new JArray("GetEvents"),
        RequestTemplate = new
        {
            Resource = "{0}?selectedFields=Items.Name;Items.Value.Value"
        },
        Parameters = new JArray("$.GetEvents.Content.Items[*].Links.Value")
    }
};

方法2：定义具名类并使用JsonProperty特性（基于Newtonsoft.Json） #

如果需要结构化的类型定义，可创建对应类并通过JsonProperty指定JSON输出的键名，兼顾C#命名规范和JSON格式需求：

public class BatchRequestItem
{
    public string Method { get; set; }
    public string Resource { get; set; }
    public RequestHeaders Headers { get; set; }
}

public class RequestHeaders
{
    [JsonProperty("Cache-Control")]
    public string CacheControl { get; set; }
}

// 构建请求体
var batchRequest = new
{
    GetEvents = new BatchRequestItem
    {
        Method = "GET",
        Resource = "https://xxxx",
        Headers = new RequestHeaders { CacheControl = "no-cache" }
    },
    GetAttributes = new
    {
        Method = "GET",
        ParentIDs = new JArray("GetEvents"),
        RequestTemplate = new
        {
            Resource = "{0}?selectedFields=Items.Name;Items.Value.Value"
        },
        Parameters = new JArray("$.GetEvents.Content.Items[*].Links.Value")
    }
};

方法3：使用ExpandoObject动态类型 #

若需要灵活构建不规则结构的JSON，可借助动态类型ExpandoObject添加任意键名的属性：

dynamic getEvents = new ExpandoObject();
getEvents.Method = "GET";
getEvents.Resource = "https://xxxx";

var headers = (IDictionary<string, object>)new ExpandoObject();
headers["Cache-Control"] = "no-cache";
getEvents.Headers = headers;

var batchRequest = new
{
    GetEvents = getEvents,
    GetAttributes = new
    {
        Method = "GET",
        ParentIDs = new JArray("GetEvents"),
        RequestTemplate = new
        {
            Resource = "{0}?selectedFields=Items.Name;Items.Value.Value"
        },
        Parameters = new JArray("$.GetEvents.Content.Items[*].Links.Value")
    }
};

内容的提问来源于stack exchange，提问作者Mver