SqlTrackingQueryOptions 构造函数

定义

命名空间:

System.Workflow.Runtime.Tracking

程序集:

System.Workflow.Runtime.dll

初始化 SqlTrackingQueryOptions 类的新实例。

public:
 SqlTrackingQueryOptions();

public SqlTrackingQueryOptions ();

Public Sub New ()

示例

下面的示例演示如何创建 SqlTrackingQueryOptions 类的实例。 此示例摘自工作流监视器 SDK 示例。 有关详细信息，请参阅 工作流监视器示例。

try
{
    List<SqlTrackingWorkflowInstance> queriedWorkflows = new List<SqlTrackingWorkflowInstance>();
    SqlTrackingQuery sqlTrackingQuery = new SqlTrackingQuery(connectionString);
    SqlTrackingQueryOptions sqlTrackingQueryOptions = new SqlTrackingQueryOptions();
    sqlTrackingQueryOptions.StatusMinDateTime = from.ToUniversalTime();
    sqlTrackingQueryOptions.StatusMaxDateTime = until.ToUniversalTime();
    // If QualifiedName, FieldName, or DataValue is not supplied, we will not query since they are all required to match
    if (!((string.Empty == trackingDataItemValue.QualifiedName) || (string.Empty == trackingDataItemValue.FieldName) || ((string.Empty == trackingDataItemValue.DataValue))))
        sqlTrackingQueryOptions.TrackingDataItems.Add(trackingDataItemValue);

    queriedWorkflows.Clear();

    if ("created" == workflowEvent.ToLower(CultureInfo.InvariantCulture))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Created;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    else if ("completed" == workflowEvent.ToLower(CultureInfo.InvariantCulture))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Completed;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    else if ("running" == workflowEvent.ToLower(CultureInfo.InvariantCulture))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Running;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    else if ("suspended" == workflowEvent.ToLower(CultureInfo.InvariantCulture))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Suspended;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    else if ("terminated" == workflowEvent.ToLower(CultureInfo.InvariantCulture))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Terminated;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    else if (("all" == workflowEvent.ToLower(CultureInfo.InvariantCulture)) || string.IsNullOrEmpty(workflowEvent))
    {
        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Created;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));

        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Completed;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));

        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Running;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));

        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Suspended;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));

        sqlTrackingQueryOptions.WorkflowStatus = WorkflowStatus.Terminated;
        queriedWorkflows.AddRange(sqlTrackingQuery.GetWorkflows(sqlTrackingQueryOptions));
    }
    return queriedWorkflows;
}
catch (Exception exception)
{
    throw new Exception("Exception in GetWorkflows", exception);
}

注解

下表显示 SqlTrackingQueryOptions 类的实例的初始属性值。

属性	值
StatusMaxDateTime	MaxValue.
StatusMinDateTime	MinValue.
TrackingDataItems	一个空 List<T>。
WorkflowStatus	空引用（在 Visual Basic 中为 Nothing）。
WorkflowType	空引用（在 Visual Basic 中为 Nothing）。

这些值指定 SqlTrackingQuery.GetWorkflows 调用应为在数据库中具有跟踪数据的每个工作流实例返回 SqlTrackingWorkflowInstance 对象。