Question

程序运行正常，但Ascending和Descending按钮不起作用。包含表中所有数据的DataGridView看起来相同但未排序。它假设按标题排序。也许它确实排序但不刷新DataGridView？

private void btnSortAscendingRecords_Click(object sender, EventArgs e)
        {
            DataView TitlesDataView = new DataView(booksDataset1.Books);

            TitlesDataView.Sort = "BookTitle ASC";

            //sort asc titles in videosgrid

        }

        private void btnSortDescendingRecords_Click(object sender, EventArgs e)
        {
            DataView TitlesDataView = new DataView(booksDataset1.Books);

            TitlesDataView.Sort = "BookTitle DESC";

            //sort descending titles in videosgrid
        }

Answer 1

您必须将DataSource设置为刚刚创建的新DataView。我假设这是Windows窗体应用程序？

如果是，那么：

[YourDataGridView].DataSource = TitlesDataView;

Answer 2

当 DataGridView 绑定到 DataSource （ DataView，BindingSource，Table，DataSet +“tablename”）时，它会引用<强>数据视图即可。获取对此DataView的引用，并根据需要设置排序（和过滤器）：

DataView dv = null;
CurrencyManager cm = (CurrencyManager)(dgv.BindingContext[dgv.DataSource, dgv.DataMember]);

if (cm.List is BindingSource)
{
    // In case of BindingSource it may be chain of BindingSources+relations
    BindingSource bs = (BindingSource)cm.List;
    while (bs.List is BindingSource)
    { bs = bs.List as BindingSource; }

    if (bs.List is DataView)
    { dv = bs.List as DataView; }
}
else if (cm.List is DataView)
{
    // dgv bind to the DataView, Table or DataSet+"tablename"
    dv = cm.List as DataView;
}

if (dv != null)
{
    dv.Sort = "somedate desc, firstname";
    // dv.Filter = "lastname = 'Smith' OR lastname = 'Doe'";

    //  You can Set the Glyphs something like this:
    int somedateColIdx = 5;    // somedate
    int firstnameColIdx = 3;   // firstname
    dgv.Columns[somedateColIdx].HeaderCell.SortGlyphDirection = SortOrder.Descending;
    dgv.Columns[firstnameColIdx].HeaderCell.SortGlyphDirection = SortOrder.Ascending;
}

注意：排序和过滤器中使用的列名对应于DataTable中的列名， DataGridView中的列名是用于在dgv中显示单元格的控件的名称。您可以像这样在DataView中使用列名：

string colName = dgv.Columns[colIdx].DataPropertyName

取决于您希望如何跟踪排序列（colSequence，colName，asc / desc，dgvColIdx），您可以决定如何构建Sort和Filter表达式并在dgv中设置SortGlyph（为简单起见，我制作了硬编码）。

DataView不会在DataGridView中对升序或降序进行排序

2 个答案: