// 获取单个选定行
protected void Button_Click(object sender, EventArgs e)
{
    if (GridView1.SelectedIndex >= 0)
    {
        // 通过索引获取行
        GridViewRow row = GridView1.SelectedRow;
        
        // 获取特定单元格的值
        string value = row.Cells[2].Text;
        
        // 或者通过数据键
        string id = GridView1.DataKeys[row.RowIndex].Value.ToString();
    }
}

// 获取多个选定行（需启用多选）
protected void Button_Click(object sender, EventArgs e)
{
    List<string> selectedValues = new List<string>();
    
    foreach (GridViewRow row in GridView1.Rows)
    {
        CheckBox chk = (CheckBox)row.FindControl("CheckBox1");
        if (chk != null && chk.Checked)
        {
            string value = row.Cells[2].Text;
            selectedValues.Add(value);
        }
    }
}

// 获取当前选定行
private void button1_Click(object sender, EventArgs e)
{
    if (dataGridView1.SelectedRows.Count > 0)
    {
        DataGridViewRow row = dataGridView1.SelectedRows[0];
        object value = row.Cells["ColumnName"].Value;
        
        // 或者通过索引
        object value2 = row.Cells[1].Value;
    }
}

// 获取多个选定行
private void button1_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow row in dataGridView1.SelectedRows)
    {
        object value = row.Cells["ColumnName"].Value;
        // 处理每一行数据
    }
}

// 获取当前选定项
private void Button_Click(object sender, RoutedEventArgs e)
{
    if (dataGrid1.SelectedItem != null)
    {
        // 假设数据绑定到自定义对象
        var selectedItem = (YourDataType)dataGrid1.SelectedItem;
        string propertyValue = selectedItem.PropertyName;
    }
}

// 获取多个选定项
private void Button_Click(object sender, RoutedEventArgs e)
{
    var selectedItems = dataGrid1.SelectedItems;
    foreach (var item in selectedItems)
    {
        var dataItem = (YourDataType)item;
        // 处理每个选定项
    }
}