[英]Windows Service An exception occurred during a WebClient request
我从Windows服务应用程序收到以下错误
System.Net.WebException = {"An exception occurred during a WebClient request."}
-2146233079
InnerException = {"Configuration system failed to initialize"}
控制台应用程序上的相同代码可以正常工作。
服务文件尚未在“本地服务”上设置安全性(在我的测试环境中)
您能否指出我可能导致该错误的原因以及如何解决该错误?
Try
Using client As New Net.WebClient
Dim reqparm As New Specialized.NameValueCollection
reqparm.Add("DeviceId", deviceId)
reqparm.Add("StatusCode", statusCode)
reqparm.Add("Type", "printer")
reqparm.Add("Message", msg)
Dim responsebytes = client.UploadValues("http://xxx.xxx.com/api/notification", "POST", reqparm)
Dim responsebody = (New Text.UTF8Encoding).GetString(responsebytes)
End Using
Catch ex As Exception
'do nothing
End Try
我的App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<configSections>
<section name="app" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<app>
<add key="version" value="0.0.1"/>
</app>
</configuration>
问题出在App.config文件中。 这是正确的版本,只有<configSections>
一个实例,并且应该是<configuration>
之后的第一个元素。
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="app" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<app>
<add key="version" value="0.0.1"/>
</app>
</configuration>
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