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PONullReferenceException when creating a web reference class
 

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  1. PONullReferenceException when creating a web reference class
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    <p>I have a C# / WPF project that references a webservice. However, sometimes I get a <code>NullReferenceException</code> when creating an instance of the auto-generated class that represents it:</p> <pre><code>var service = new SSO(); </code></pre> <p>The stacktrace is as follows:</p> <pre><code>System.NullReferenceException: Object reference not set to an instance of an object. in System.Xml.Serialization.XmlSerializer.GetSerializersFromCache(XmlMapping[] mappings, Type type) in System.Xml.Serialization.XmlSerializer.FromMappings(XmlMapping[] mappings, Type type) in System.Web.Services.Protocols.SoapClientType..ctor(Type type) in System.Web.Services.Protocols.SoapHttpClientProtocol..ctor() in MyNamespace.SSO..ctor() </code></pre> <p>Does anyone have an idea what's going on here? The server may have small periods of downtime, but that's not the exception I expect to see in case of network connection issues!</p> <p>Update: the code of the auto-generated class <code>SSO</code> in case someone finds it relevant:</p> <pre><code>[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Web.Services", "4.0.30319.17929")] [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Web.Services.WebServiceBindingAttribute(Name="SSOSoap", Namespace="http://schemas.example.com/SSO")] public partial class SSO : System.Web.Services.Protocols.SoapHttpClientProtocol { public SSO() { this.Url = "http://example.com/SSO.asmx"; if ((this.IsLocalFileSystemWebService(this.Url) == true)) { this.UseDefaultCredentials = true; this.useDefaultCredentialsSetExplicitly = false; } else { this.useDefaultCredentialsSetExplicitly = true; } } // a lot of methods here } </code></pre>
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    1. USImpworks
    1. USImpworks
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    1. COPost the constuctor for `SSO`
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      1. PONullReferenceException when creating a web reference class
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    2. COSSO is the auto-generated class created by Visual Studio when I add a web reference. The actual code is not releavant, because `SSO` inherits from `SoapHttpClientProtocol` and the base constructor is called before any code can execute.
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    3. CO"_The actual code is not relevant_" ... if I had a nickle for every time I'd heard that ;-)
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      1. PONullReferenceException when creating a web reference class
      1. USWim Ombelets
 

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