devexpress如何隐藏PropertyGridControl中的行

引言

PropertyGridControl实际是Vertical Grid，它的每一行对应的是PropertyGridControl.SelectedObject中的属性，如果我想根据值隐藏行应该怎么做呢？

解决方案

假如我现在只需要显示Course.Id=2的DicClassRoomId_Name栏位，查看Tree Traversal可知,可以通过VGridRowsIterator.DoOperation 方法遍历整个树达到自定义行内容的功能。

为此需要实现一个RowOperation (完整代码在文末)

public class SetDicRowVisibleRowOperation : DevExpress.XtraVerticalGrid.Rows.RowOperation
{
    public override void Execute(DevExpress.XtraVerticalGrid.Rows.BaseRow row)
    {
        Console.WriteLine(row.Properties.Caption);   
        if (row.Tag is Course course)
        {
            var fieldName = nameof(Student.ListCourses) + "." + course.IndexName + "." +
                               nameof(Course.DicClassRoomId_Name);
            if (row.Properties.FieldName == fieldName)
                row.Visible = course.Id == 2;
        }
    }
}

在遍历之前，还需为Row保存相关信息

private void Form1_Load(object sender, EventArgs e)
{
    var student = GetTestStudent();
    propertyGridControl1.SelectedObject = student;
    propertyGridControl1.OptionsBehavior.PropertySort = DevExpress.XtraVerticalGrid.PropertySort.NoSort;
    propertyGridControl1.ExpandAllRows();

    //set row Tag info
    student.ListCourses.ForEach(x =>
                {
                    //IndexName set by CourseCollectionPropertyDescriptor constructor
                    var fieldName = nameof(Student.ListCourses) + "." + x.IndexName + "." +
                    nameof(Course.DicClassRoomId_Name);
                    var row = propertyGridControl1.GetRowByFieldName(fieldName);
                    row.Tag = x;
                });

    propertyGridControl1.RowsIterator.DoOperation(new SetDicRowVisibleRowOperation());
}