MY JSON字符串json.parse允许空或丢失
{
"name": "username",
"status": "mystatus",
"place": {
"name": "placename",
}
我的代码
Dim request As HttpWebRequest
Dim response As HttpWebResponse = Nothing
Dim reader As StreamReader
Try
request = DirectCast(WebRequest.Create("http://myjsonstring.com/json"), HttpWebRequest)
response = DirectCast(request.GetResponse(), HttpWebResponse)
reader = New StreamReader(response.GetResponseStream())
Dim rawresp As String
rawresp = reader.ReadToEnd()
Dim jResults As JObject = JObject.Parse(rawresp)
if (rawresp != null)
name.Text = jResults("name").ToString()
status.Text = jResults("status").ToString()
placename.Text = jResults("place")("name").ToString()
End If
Catch ex As System.Net.WebException
MsgBox(ex.ToString)
Finally
If Not response Is Nothing Then response.Close()
End Try
我的问题是,有时我的JSON可能看起来像这样
{
"name": "username",
"place": {
"name": "placename",
}
我的JSON解释
"name": "name here",
"items": {
"myitem": {
"icon": "myitem.jpg",
"myitem2": {
"icon": "myitem2.jpg",
}
我的代码我已经试过
myitem.Text = If(jResults2("items")("myitem")("icon") Is Nothing, "", jResults2("items")("myitem")("icon").ToString())
myitem2.Text = If(jResults2("items")("myitem2")("icon") Is Nothing, "", jResults2("items")("myitem2")("icon").ToString())
当值从myitem缺少它停止JSON和myitem2永远不会显示。
发生这种情况我的项目抛出一个空值异常,我已严厉地压缩了我的json字符串和代码的可读性,但我的问题是有一种方法来处理错误,当“状态”从字符串中丢失并继续解析其余的对象?
或者,如果它可能的时候这个值是缺失/ null替换它的东西,但如果这条路线被选中,我想为每个设置一个不同的值。
在执行'.ToString()'之前,检查'jResults(“status”)'为null('Nothing')。 –