从动态 ExpandoObject 创建 JSON 数组

Question

我正在使用 C# 并尝试从动态对象创建 JSON 字符串。

string jsonObj = string.Empty;
dynamic DetailObj = new ExpandoObject();
foreach (DataRow row in dtDetails.Rows)
{
    DetailObj.ID = row["ID"].ToString();
    DetailObj.Description = row["Description"].ToString();
    DetailObj.ExpDate = row["Date"].ToString();
}            

dynamic EmailObj = new ExpandoObject();
foreach (DataRow row in dtReturnData.Rows)
{
    EmailObj.ID = row["EmailTypeId"].ToString();
    EmailObj.FirstName = row["FirstName"].ToString();
    EmailObj.LastName = row["LastName"].ToString();
    EmailObj.Details = DetailObj;
    EmailObj.Email = row["Email"].ToString();
}

jsonObj = JsonConvert.SerializeObject(EmailObj);

我正在尝试获取输出字符串：

[{"ID":"5","FirstName":"Joe","LastName":"Johnson","Details":[{"ID":"1","Description":"Player1","ExpDate":"08/30/2021 00:00:00"}],"Email":"joejohnson@sample.com"}]

但我目前得到的是：

"{"ID":"5","FirstName":"Joe","LastName":"Johnson","Details":{"ID":"1","Description":"Player1","ExpDate":"08/30/2021 00:00:00"},"Email":"joejohnson@sample.com"}"

想要的输出和当前输出的区别在于整个JSON开头和结尾的[]，而不是“”，还有[=26=里面的detailobj对象].

如何更改输出？

此外，dtDetails 包含多行，所有这些行都需要在 JSON 详细信息对象中传递。目前，我得到作为 DetailObj 的一部分传递的单行。有办法纠正吗？

Answer 1

问题是您在迭代时覆盖了所有这些字段的值。你想要做的是有一个动态对象列表。例如：

List<dynamic> EmailObj = new List<ExpandoObject>();
foreach (DataRow row in dtReturnData.Rows)
{
     var item = new ExpandoObject();
     item.ID = row["EmailTypeId"].ToString();
     item.FirstName = row["FirstName"].ToString();
     item.LastName = row["LastName"].ToString();
     item.Details = DetailObj;
     item.Email = row["Email"].ToString();
     EmailObj.Add(item);
}

从动态 ExpandoObject 创建 JSON 数组

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