1.gridview大文本所在的单元格加上RepositoryItemMemoEdit ,举例来说
DevExpress.XtraEditors.Repository.RepositoryItemMemoEdit memoEditBigText = new DevExpress.XtraEditors.Repository.RepositoryItemMemoEdit();
this.gridView1.Columns["LongName"].ColumnEdit = memoEditBigText;
2.修改gridview控件属性OptionsView里的RowAutoHeight项的属性为True;
this.gridView1.OptionsView.RowAutoHeight = true;