Asynchronous creation of FeatureClass with BackgroundWorker failed

Question

I use BackgroundWorker to create asynchronous class elements. When running to

IFeatureClass pFeatureClass = pFeatureWorksapce.CreateFeatureClass(pFileName, pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");

the form of AppCrash is popped up. The error code is c0000005. When I no longer use BackgroundWorker to create a FeatureClass. This method is normal.

mBackgroundWorker = new BackgroundWorker();
mBackgroundWorker.DoWork += new DoWorkEventHandler(mBackgroundWorker_DoWork);

private void mBackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
    FeatureClassCreatorParams pParams = new FeatureClassCreatorParams();
    IFeatureClass pFeatureClass = CreateShapefile(pParams);
}
public IFeatureClass CreateShapefile(FeatureClassCreatorParams param)
{
    if (param == null)
    {
        throw new ArgumentNullException("FeatureClassCreatorParams is null");
    }
    param.Verify();
    List<FieldClassInfo> pFieldList = ReadXml(param.XmlPath);
    IFeatureClass pFeatureClass = CreateShpFileStructure(param.SavePath, pFieldList, param.GeometryType, param.SpatialReference, param.HasZ);
    return pFeatureClass;
}
private IFeatureClass CreateShpFileStructure(string fileName, List<FieldClassInfo> fields, esriGeometryType geoType, ISpatialReference spatialReference, bool hasZ)
{
    string pFloder = System.IO.Path.GetDirectoryName(fileName);
    string pFileName = System.IO.Path.GetFileNameWithoutExtension(fileName);
    if (!Directory.Exists(pFloder))
    {
        Directory.CreateDirectory(pFloder);
    }
    IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();
    IFeatureWorkspace pFeatureWorksapce = pWorkspaceFactory.OpenFromFile(pFloder, 0) as IFeatureWorkspace;
    IFields pFields = new FieldsClass();
    IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;

        // 添加几何字段
    IField pShapeField = new FieldClass();
    IFieldEdit pShapeFieldEdit = pShapeField as IFieldEdit;
    pShapeFieldEdit.Name_2 = "Shape";
    pShapeFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;

    IGeometryDef pGeometryDef = new GeometryDefClass();
    IGeometryDefEdit pGeometryDefEdit = pGeometryDef as IGeometryDefEdit;
    pGeometryDefEdit.GeometryType_2 = geoType;
    pGeometryDefEdit.HasZ_2 = hasZ;
    pGeometryDefEdit.SpatialReference_2 = spatialReference;
    pShapeFieldEdit.GeometryDef_2 = pGeometryDef;
    pFieldsEdit.AddField(pShapeField);

        //foreach (FieldClassInfo field in fields)
        //{
        //    IField pField = new FieldClass();
        //    IFieldEdit pFieldEdit = pField as IFieldEdit;
        //    pFieldEdit.Name_2 = field.Name;
        //    pFieldEdit.Type_2 = field.FieldType;
        //    pFieldEdit.AliasName_2 = field.Caption;
        //    pFieldEdit.Length_2 = field.Length;
        //    pFieldsEdit.AddField(pField);
        //}

    // Throw Error:appCrash
    IFeatureClass pFeatureClass = pFeatureWorksapce.CreateFeatureClass(pFileName, pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");
    }