如何排序数据绑定的DataGridView列? [英] How to sort databound DataGridView column?

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问题描述

我知道有很多关于这个主题的问题。我已经通过所有的人,但似乎没有任何帮助。

如何通过单击列标题进行排序?

我应该如何修改此code做这项工作?

 公共部分Form1类:表格
{    公共Form1中()
    {        清单< MyClass的>名单=新名单,LT; MyClass的>();
        list.Add(新MyClass的(彼得,1202));
        list.Add(新MyClass的(詹姆斯,292));
        list.Add(新MyClass的(债券,23));        BindingSource的BS =新的BindingSource();
        bs.DataSource =清单;        DataGridView的DG =新的DataGridView();        DataGridViewTextBoxColumn C =新DataGridViewTextBoxColumn();
        c.Name =名;
        c.DataPropertyName =姓名;
        dg.Columns.Add(C);        C =新DataGridViewTextBoxColumn();
        c.Name =数字;
        c.DataPropertyName =号码;
        dg.Columns.Add(C);        dg.DataSource = BS;        this.Controls.Add((控制)DG);    }}MyClass类:IComparable的< MyClass的>
{
    公共字符串名称{;组; }
    公众诠释号码{搞定;组; }    公共MyClass的(){}    公共MyClass的(字符串名称,诠释号)
    {
        名称=名称;
        数=数;
    }    公共重写字符串的ToString()
    {
        返回的String.Format({0}:{1},姓名,号码);
    }    #地区IComparable的< MyClass的>会员    公众诠释的CompareTo(MyClass的除外)
    {
        返回Name.CompareTo(other.Name);
    }    #endregion
}


解决方案

我记得有找到的东西,当我整理添加到我的DataGrid中也将工作的问题。您可以通过先添加下面的类到项目实施排序可绑定列表。这是一个列表实现实现的BindingList< T> ,让您可以将DataGrid绑定到它,它也支持排序。细节更好的解释比我可以给是 MSDN这里

 公共类SortableBindingList< T> :&的BindingList LT; T>
{
    私人ArrayList的排序列表;
    私人ArrayList的unsortedItems;
    私人布尔isSortedValue;公共SortableBindingList()
{
}公共SortableBindingList(IList的< T>清单)
{
    的foreach(列表中的对象o)
    {
        this.Add((T)O);
    }
}保护覆盖布尔SupportsSearchingCore
{
    得到
    {
        返回true;
    }
}保护覆盖INT FindCore(PropertyDescriptor的道具,对象键)
{
    的PropertyInfo propInfo = typeof运算(T).GetProperty(prop.Name);
    Ť项目;    如果(关键!= NULL)
    {
       的for(int i = 0; I<计数; ++ I)
        {
            项目=(T)项目[I];
            如果(propInfo.GetValue(项目,空).Equals(密钥))
                返回我;
        }
    }
    返回-1;
}公众诠释查找(字符串属性,对象键)
{
    PropertyDescriptorCollection属性=
        TypeDescriptor.GetProperties(typeof运算(T));
    PropertyDescriptor的道具= properties.Find(房地产,真实);    如果(道具== NULL)
        返回-1;
    其他
        返回FindCore(道具,键);
}保护覆盖布尔SupportsSortingCore
{
    获得{返回true; }
}
保护覆盖布尔IsSortedCore
{
    {返回isSortedValue; }
}ListSortDirection sortDirectionValue;
PropertyDescriptor与sortPropertyValue;保护覆盖无效ApplySortCore(PropertyDescriptor的道具,
    ListSortDirection方向)
{
    排序列表=新的ArrayList();   键入interfaceType = prop.PropertyType.GetInterface(IComparable的);    如果(interfaceType == NULL和放大器;&安培; prop.PropertyType.IsValueType)
    {
        键入underlyingType = Nullable.GetUnderlyingType(prop.PropertyType);         如果(underlyingType!= NULL)
        {
            interfaceType = underlyingType.GetInterface(IComparable的);
        }
    }    如果(interfaceType!= NULL)
    {
        sortPropertyValue =道具;
        sortDirectionValue =方向;        IEnumerable的< T>查询= base.Items;
        如果(方向== ListSortDirection.Ascending)
        {
            查询= query.OrderBy(ⅰ= GT; prop.GetValue(ⅰ));
        }
        其他
        {
            查询= query.OrderByDescending(ⅰ= GT; prop.GetValue(ⅰ));
        }
        INT newIndex = 0;
        的foreach(在查询对象的项目)
        {
            this.Items [newIndex] =(T)项目;
            newIndex ++;
        }
        isSortedValue =真;
        this.OnListChanged(新ListChangedEventArgs(ListChangedType.Reset,-1));    }
    其他
    {
        抛出新NotSupportedException异常(无法通过排序+ prop.Name +
            这+ prop.PropertyType.ToString()+
            不实现IComparable);
    }
}保护覆盖无效RemoveSortCore()
{
    INT位置;
    对象温度;    如果(unsortedItems!= NULL)
    {
        的for(int i = 0; I< unsortedItems.Count;)
        {
            位置= this.Find(姓氏
                unsortedItems [I] .GetType()。
                的getProperty(姓氏)的GetValue(unsortedItems [I],NULL))。
            如果(位置大于0&放大器;&放大器;!位置=ⅰ)
            {
                TEMP =这个[我]
                这[一] =本[位置]
                这个[位置] =(T)温度;
                我++;
            }
            否则,如果(位置== I)
                我++;
            其他
                unsortedItems.RemoveAt(ⅰ);
        }
        isSortedValue = FALSE;
        OnListChanged(新ListChangedEventArgs(ListChangedType.Reset,-1));
    }
}公共无效RemoveSort()
{
    RemoveSortCore();
}
保护覆盖的PropertyDescriptor SortPropertyCore
{
    {返回sortPropertyValue; }
}保护覆盖ListSortDirection SortDirectionCore
{
    {返回sortDirectionValue; }
}}

通过在地方,只有你需要对你在上面张贴的code中的变化是根据你的清单上创建一个SortableBindingList并绑定到排序列表,而不是标准之一,像这样

 列表< MyClass的>名单=新名单,LT; MyClass的>();
list.Add(新MyClass的(彼得,1202));
list.Add(新MyClass的(詹姆斯,292));
list.Add(新MyClass的(债券,23));//添加排序列表...
SortableBindingList< MyClass的> sortableList =新SortableBindingList< MyClass的>(名单);BindingSource的BS =新的BindingSource();
bs.DataSource = sortableList; //绑定到排序列表

而这将足以让你去。

I know that there are a lot of questions on this topic. I have been through all of them but nothing seems to help.

How to sort by clicking on column header?

How should I modify this code to do the job?

public partial class Form1 : Form
{

    public Form1()
    {

        List<MyClass> list = new List<MyClass>();
        list.Add(new MyClass("Peter", 1202));
        list.Add(new MyClass("James", 292));
        list.Add(new MyClass("Bond", 23));

        BindingSource bs = new BindingSource();
        bs.DataSource = list;

        DataGridView dg = new DataGridView();

        DataGridViewTextBoxColumn c = new DataGridViewTextBoxColumn();
        c.Name = "name";
        c.DataPropertyName = "Name";
        dg.Columns.Add(c);

        c = new DataGridViewTextBoxColumn();
        c.Name = "number";
        c.DataPropertyName = "Number";
        dg.Columns.Add(c);

        dg.DataSource = bs;

        this.Controls.Add((Control)dg);

    }

}

class MyClass:IComparable<MyClass>
{
    public string Name { get; set; }
    public int Number { get; set; }

    public MyClass(){}

    public MyClass(string name,int number)
    {
        Name = name;
        Number = number;
    }

    public override string ToString()
    {
        return string.Format("{0}:{1}",Name,Number);
    }

    #region IComparable<MyClass> Members

    public int CompareTo(MyClass other)
    {
        return Name.CompareTo(other.Name);
    }

    #endregion
}

解决方案

I recall having issues finding something that would work when I added sorting to my datagrids too. You can implement a sortable bindable list by first adding the following class to your project. It is a list implementation that implements BindingList<T>, so that you can bind your datagrid to it, and it also supports sorting. A better explanation of the details than I could give is on MSDN here

public class SortableBindingList<T> : BindingList<T>
{
    private ArrayList sortedList;
    private ArrayList unsortedItems;
    private bool isSortedValue;

public SortableBindingList()
{
}

public SortableBindingList(IList<T> list)
{
    foreach (object o in list)
    {
        this.Add((T)o);
    }
}

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

protected override int FindCore(PropertyDescriptor prop, object key)
{
    PropertyInfo propInfo = typeof(T).GetProperty(prop.Name);
    T item;

    if (key != null)
    {
       for (int i = 0; i < Count; ++i)
        {
            item = (T)Items[i];
            if (propInfo.GetValue(item, null).Equals(key))
                return i;
        }
    }
    return -1;
}

public int Find(string property, object key)
{
    PropertyDescriptorCollection properties =
        TypeDescriptor.GetProperties(typeof(T));
    PropertyDescriptor prop = properties.Find(property, true);

    if (prop == null)
        return -1;
    else
        return FindCore(prop, key);
}

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


protected override bool IsSortedCore
{
    get { return isSortedValue; }
}

ListSortDirection sortDirectionValue;
PropertyDescriptor sortPropertyValue;

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

   Type interfaceType = prop.PropertyType.GetInterface("IComparable");

    if (interfaceType == null && prop.PropertyType.IsValueType)
    {
        Type underlyingType = Nullable.GetUnderlyingType(prop.PropertyType);

         if (underlyingType != null)
        {
            interfaceType = underlyingType.GetInterface("IComparable");
        }
    }

    if (interfaceType != null)
    {
        sortPropertyValue = prop;
        sortDirectionValue = direction;

        IEnumerable<T> query = base.Items;
        if (direction == ListSortDirection.Ascending)
        {
            query = query.OrderBy(i => prop.GetValue(i));
        }
        else
        {
            query = query.OrderByDescending(i => prop.GetValue(i));
        }
        int newIndex = 0;
        foreach (object item in query)
        {
            this.Items[newIndex] = (T)item;
            newIndex++;
        }
        isSortedValue = true;
        this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));

    }
    else
    {
        throw new NotSupportedException("Cannot sort by " + prop.Name +
            ". This" + prop.PropertyType.ToString() +
            " does not implement IComparable");
    }
}

protected override void RemoveSortCore()
{
    int position;
    object temp;

    if (unsortedItems != null)
    {
        for (int i = 0; i < unsortedItems.Count; )
        {
            position = this.Find("LastName",
                unsortedItems[i].GetType().
                GetProperty("LastName").GetValue(unsortedItems[i], null));
            if (position > 0 && position != i)
            {
                temp = this[i];
                this[i] = this[position];
                this[position] = (T)temp;
                i++;
            }
            else if (position == i)
                i++;
            else
                unsortedItems.RemoveAt(i);
        }
        isSortedValue = false;
        OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
    }
}

public void RemoveSort()
{
    RemoveSortCore();
}
protected override PropertyDescriptor SortPropertyCore
{
    get { return sortPropertyValue; }
}

protected override ListSortDirection SortDirectionCore
{
    get { return sortDirectionValue; }
}

}

With that in place, the only changes you need to make to the code that you have posted above is to create a SortableBindingList based on your list and bind to the sortable list, rather than the standard one, like so:

List<MyClass> list = new List<MyClass>();
list.Add(new MyClass("Peter", 1202));
list.Add(new MyClass("James", 292));
list.Add(new MyClass("Bond", 23));

// Added sortable list...
SortableBindingList<MyClass> sortableList = new SortableBindingList<MyClass>(list);

BindingSource bs = new BindingSource();
bs.DataSource = sortableList;   // Bind to the sortable list

And that will be enough to get you going.

这篇关于如何排序数据绑定的DataGridView列?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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