DataGridView使用Business Objects排序列

Question

我正在设置我的DataGridView,如下所示:

        jobs = new List<DisplayJob>();

        uxJobList.AutoGenerateColumns = false;
        jobListBindingSource.DataSource = jobs;
        uxJobList.DataSource = jobListBindingSource;

        int newColumn;
        newColumn = uxJobList.Columns.Add("Id", "Job No.");
        uxJobList.Columns[newColumn].DataPropertyName = "Id";
        uxJobList.Columns[newColumn].DefaultCellStyle.Format = Global.JobIdFormat;
        uxJobList.Columns[newColumn].DefaultCellStyle.Font = new Font(uxJobList.DefaultCellStyle.Font, FontStyle.Bold);
        uxJobList.Columns[newColumn].AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
        uxJobList.Columns[newColumn].Width = 62;
        uxJobList.Columns[newColumn].Resizable = DataGridViewTriState.False;
        uxJobList.Columns[newColumn].SortMode = DataGridViewColumnSortMode.Automatic;
        :
        :

DisplayJob类的外观如下:

    public class DisplayJob
{
    public DisplayJob(int id)
    {
        Id = id;
    }

    public DisplayJob(JobEntity job)
    {
        Id = job.Id;
        Type = job.JobTypeDescription;
        CreatedAt = job.CreatedAt;
        StartedAt = job.StartedAt;
        ExternalStatus = job.ExternalStatus;
        FriendlyExternalStatus = job.FriendlyExternalStatus;
        ExternalStatusFriendly = job.ExternalStatusFriendly;
        CustomerName = job.Customer.Name;
        CustomerKey = job.Customer.CustomerKey;
        WorkAddress = job.WorkAddress;
        CreatedBy = job.CreatedBy;
        CancelledAt = job.CancelledAt;
        ClosedAt = job.ClosedAt;
        ReasonWaiting = job.ReasonWaiting;
        CancelledBy = job.CancelledBy;
        CancelledReason = job.CancelledReason;
        DisplayCreator = Global.GetDisplayName(CreatedBy);
        ActionRedoNeeded = job.ActionRedoNeeded;
        if (job.Scheme != null)
        {
            SchemeCode = job.Scheme.Code;
        }

    }

    public int Id { get; private set; }
    public string Type { get; private set; }
    public DateTime CreatedAt { get; private set; }
    public DateTime? StartedAt { get; private set; }
    public string ExternalStatus { get; private set; }
    public string FriendlyExternalStatus { get; private set; }
    public string ExternalStatusFriendly { get; private set; }
    public string CustomerName { get; private set; }
    public string CustomerKey { get; private set; }
    public string WorkAddress { get; private set; }
    public string CreatedBy { get; private set; }
    public DateTime? CancelledAt { get; private set; }
    public DateTime? ClosedAt { get; private set; }
    public string CancelledBy { get; private set; }
    public string ReasonWaiting { get; private set; }
    public string DisplayCreator { get; private set; }
    public string CancelledReason { get; private set; }
    public string SchemeCode { get; private set; }
    public bool ActionRedoNeeded { get; private set; }
}

但是列排序不起作用.让这个工作的最佳方法是什么？

Answer 1

如果要支持对集合进行排序和搜索,只需从BindingList参数化类型派生类,并覆盖一些基类方法和属性.

最好的方法是扩展BindingList并执行以下操作:

protected override bool SupportsSearchingCore
{
    get
    {
        return true;
    }
}

protected override bool SupportsSortingCore
{
    get { return true; }
}

您还需要实现排序代码:

ListSortDirection sortDirectionValue;
PropertyDescriptor sortPropertyValue;

protected override void ApplySortCore(PropertyDescriptor prop, 
    ListSortDirection direction)
{
    sortedList = new ArrayList();

    // Check to see if the property type we are sorting by implements
    // the IComparable interface.
    Type interfaceType = prop.PropertyType.GetInterface("IComparable");

    if (interfaceType != null)
    {
        // If so, set the SortPropertyValue and SortDirectionValue.
        sortPropertyValue = prop;
        sortDirectionValue = direction;

        unsortedItems = new ArrayList(this.Count);

        // Loop through each item, adding it the the sortedItems ArrayList.
        foreach (Object item in this.Items) {
            sortedList.Add(prop.GetValue(item));
            unsortedItems.Add(item);
        }
        // Call Sort on the ArrayList.
        sortedList.Sort();
        T temp;

        // Check the sort direction and then copy the sorted items
        // back into the list.
        if (direction == ListSortDirection.Descending)
            sortedList.Reverse();

        for (int i = 0; i < this.Count; i++)
        {
            int position = Find(prop.Name, sortedList[i]);
            if (position != i) {
                temp = this[i];
                this[i] = this[position];
                this[position] = temp;
            }
        }

        isSortedValue = true;

        // Raise the ListChanged event so bound controls refresh their
        // values.
        OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
    }
    else
        // If the property type does not implement IComparable, let the user
        // know.
        throw new NotSupportedException("Cannot sort by " + prop.Name +
            ". This" + prop.PropertyType.ToString() + 
            " does not implement IComparable");
}

如果您需要更多信息,可以随时访问并获取有关如何扩展绑定列表的所有说明.

Answer 2

Daok的解决方案是正确的.它的工作量往往超过它的价值.

懒人获得所需功能的方法是从业务对象创建并填充DataTable,并将DataGridView绑定到该对象.

这种方法有很多用例无法处理(比如编辑),显然浪费了时间和空间.正如我所说,这是懒惰的.

但它写起来很容易,而且结果代码看起来比实现的更神秘IBindingList.

此外,您至少已经编写了很多代码,或者至少编写了类似的代码:您编写的用于定义DataTable的代码使您无需编写代码来创建DataGridView的列,因为DataGridView将构造其列绑定时关闭DataTable.