这是我作为作家在 stackoverflow 上的首次亮相。我叠...

我有 Windows 窗体应用程序。我将 ServiceReference 添加到 .wsdl Web 服务。一切正常，但我在从泛型类初始化字段时遇到问题。

这个类看起来如下：

public partial class setHuntingGroupRequest : object, System.ComponentModel.INotifyPropertyChanged {

    private string fwSessionIdField;

    private string pbxNameField;

    private AlcHuntingGroup huntingGroupField;

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=0)]
    public string fwSessionId {
        get {
            return this.fwSessionIdField;
        }
        set {
            this.fwSessionIdField = value;
            this.RaisePropertyChanged("fwSessionId");
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=1)]
    public string pbxName {
        get {
            return this.pbxNameField;
        }
        set {
            this.pbxNameField = value;
            this.RaisePropertyChanged("pbxName");
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=2)]
    public AlcHuntingGroup huntingGroup {
        get {
            return this.huntingGroupField;
        }
        set {
            this.huntingGroupField = value;
            this.RaisePropertyChanged("huntingGroup");
        }
    }

所以我有 fwSessionId、pbxName 和嵌套的 AlcHuntingGroup，它看起来：

   public partial class AlcHuntingGroup : object, System.ComponentModel.INotifyPropertyChanged {

        private string directoryNumberField;

        private string directoryNameField;

        private AlcHuntingGroupSearchType searchTypeField;

        private string[] membersField;

        private bool unavailableAuthorizedField;

        private bool releaseAfterTimerField;

        private string overflowDirectoryNumberField;

        private int entityField;

（……）

我的代码如何工作：

        private void btnDodajnrdohg_Click(object sender, EventArgs e)
        {

        SoapDemo.ServiceReference1.AlcPbxManagementPortTypeClient soap = new 
        SoapDemo.ServiceReference1.AlcPbxManagementPortTypeClient();

        setHuntingGroupRequest request = new setHuntingGroupRequest();
        setHuntingGroupResponse response = new setHuntingGroupResponse();

        request.fwSessionId = session_id;
        request.pbxName = "demooxemai42";

        try
            {

            response = soap.setHuntingGroup(request);

            this.output.Text = response.resultCode.ToString();
            }
            catch (Exception error)
            {

            this.output.Text = "Error in request: " + error + "\n";
            }
          }

在上面的示例中，我插入以请求两个字段。不幸的是，我还必须插入来自 AlcHuntingGroup 类的所有字段（huntingGroup 是对此类的引用）。我试过这个：

request.fwSessionId = session_id;
request.pbxName = "demooxemain2";
request.huntingGroup.directoryName = "Directory Name";
request.huntingGroup.directoryNumber = "1001";
request.huntingGroup.entity = 1;
//etc

Intellisense 正确地看到了这个字段，但是当我开始调试这个代码时，它会在我有的地方返回一个错误 request.huntingGroup.directoryName = "Directory Name";

System.NullReferenceException：未将对象引用设置为对象的实例 SoapDemo.ServiceReference1.setHuntingGroupRequest.huntingGroup.get 返回 null。

如何防止从huntingGroup 获得空值？