c# - 选择器内图像的数据读取器问题

Question

我引用了下面的 Ruslan 帖子并实现了相同的操作并按预期工作但有时，我面临一个问题，如“在处理字段 ItemRequiresTerms 期间发生错误:已经有一个与此命令关联的打开的 DataReader，它必须是先关门。”

How to show images inside selector lookup?

一个 Stock Item 可能有多个图像，我们只需要图标图像。下面是代码。

public void InventoryItemRowSelecting(PXCache sender, PXRowSelectingEventArgs e)
    {
        var row = e.Row as InventoryItem;
        if (row != null)
        {
            if (!string.IsNullOrEmpty(row.ImageUrl))
            {
                foreach (NoteDoc noteDoc in PXSelectReadonly<NoteDoc, Where<NoteDoc.noteID, Equal<Required<NoteDoc.noteID>>>>.Select(Base, row.NoteID)) // here i got error
                {
                    foreach (UploadFile uploadFile in PXSelectReadonly<UploadFile, Where<UploadFile.fileID, Equal<Required<UploadFile.fileID>>>>.Select(Base, noteDoc.FileID))
                    {
                        if (uploadFile.Name.Contains("icon"))
                        {
                            row.ImageUrl =
                            ControlHelper.GetAttachedFileUrl(null, uploadFile.FileID.ToString());
                            break;
                        }
                    }
                }
            }
        }
    }

Answer 1

您需要使用单独的连接范围在 RowSelecting 事件处理程序中执行额外的 BQL 语句。

可以找到更多详细信息here .

您可以通过使用适当的 Join 来避免嵌套 for 循环，

public void InventoryItemRowSelecting(PXCache sender, PXRowSelectingEventArgs e)
{
    var row = e.Row as InventoryItem;
    if (row != null)
    {
        if (!string.IsNullOrEmpty(row.ImageUrl))
        {
            using (new PXConnectionScope())
            {
                UploadFile uploadFile = PXSelectReadonly2<UploadFile, InnerJoin<NoteDoc, On<NoteDoc.fileID, Equal<UploadFile.fileID>>>,
                                                Where<NoteDoc.noteID, Equal<Required<NoteDoc.noteID>>,
                                                And<UploadFile.name, Like<Required<UploadFile.name>>>>>.
                                                Select(Base, row.NoteID, "%icon%");
                row.ImageUrl = (uploadFile != null) ? ControlHelper.GetAttachedFileUrl(null, uploadFile.FileID.ToString()) 
                                                        : null;
            }
        }
    }
}