The type initializer for 'Microsoft.Data.SqlClient.SqlConnection' threw an exception.

Describe the bug

Exception message: The type initializer for 'Microsoft.Data.SqlClient.SqlConnection' threw an exception.
Stack trace: System.TypeInitializationException: The type initializer for 'Microsoft.Data.SqlClient.SqlConnection' threw an exception.
 ---> System.InvalidOperationException: Failed to read the configuration section for enclave providers. Make sure the section is correctly formatted in your application configuration file. Error Message: Configuration system failed to initialize
 ---> System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize
 ---> System.Configuration.ConfigurationErrorsException: An error occurred loading a configuration file: Could not load type 'System.ComponentModel.AsyncCompletedEventArgs' from assembly 'System.Net.WebHeaderCollection, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. (/root/HaproxyUpdater2/Config/machine.config)
 ---> System.TypeLoadException: Could not load type 'System.ComponentModel.AsyncCompletedEventArgs' from assembly 'System.Net.WebHeaderCollection, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at System.Configuration.ClientConfigurationHost.OpenStreamForRead(String streamName)
   at System.Configuration.Internal.DelegatingConfigHost.OpenStreamForRead(String streamName)
   at System.Configuration.ImplicitMachineConfigHost.OpenStreamForRead(String streamName)
   at System.Configuration.BaseConfigurationRecord.InitConfigFromFile()
   --- End of inner exception stack trace ---
   at System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal)
   at System.Configuration.BaseConfigurationRecord.ThrowIfParseErrors(ConfigurationSchemaErrors schemaErrors)
   at System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors()
   at System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey)
   --- End of inner exception stack trace ---
   at System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey)
   at System.Configuration.ClientConfigurationSystem.PrepareClientConfigSystem(String sectionName)
   at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)
   at System.Configuration.ConfigurationManager.GetSection(String sectionName)
   at Microsoft.Data.SqlClient.SqlConnection..cctor()
   --- End of inner exception stack trace ---
   at Microsoft.Data.SqlClient.SqlConnection..cctor()
   --- End of inner exception stack trace ---
   at Microsoft.Data.SqlClient.SqlConnection..ctor(String connectionString)

To reproduce

Include a complete code listing (or project/solution) that we can run to reproduce the issue.

Partial code listings, or multiple fragments of code, will slow down our response or cause us to push the issue back to you to provide code to reproduce the issue.

new SqlConnection()

Expected behavior

No exception

Further technical details

Microsoft.Data.SqlClient version: 1.0.19221.1-Preview .NET target: Core 3.0 preview8 SQL Server version: SQL Server 2016 Operating system: Centos7

Additional context

[glucaci]

On my PC I also could not reproduced it, but deployed on Windows Server 2016 I get this error. Working version uses System.Data.SqlClient 4.7.0 and System.Configuration.ConfigurationManager 4.6.0

[cheenamalhotra]

Hi @pengweiqhca

FYI… We were able to identity and fix the issue with “System.Configuration.ConfigurationManager” references for .NET Framework targets and the fix will be available in GA release for 1.0.