Question

我在Zebra MC2180移动条形码扫描仪上运行了一个基本的Compact Framework v3.5应用程序，并且有一个非常间歇性的问题。

偶尔（大约在20次左右的扫描中），所有标签，按钮等上设置的所有字体样式都会丢失并恢复为默认的9号字体。任何特定的“粗体”设置或字体大小都会丢失。

没有抛出任何异常，除了丢失的字体样式之外没有任何迹象表明出现了错误....

如果我在字体样式属性上写了一个跟踪，当字体信息丢失时，我得到一个System.Drawing异常但没有进一步的信息。在我看来它试图访问一个未设置的属性？例如：

System.Diagnostics.Trace.WriteLine(btn_orderChecking.Font.Style);

产生（非常间歇）：

A first chance exception of type 'System.Exception' occurred in System.Drawing.dll
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll
A first chance exception of type 'System.Exception' occurred in System.Windows.Forms.dll
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in Symbol.Barcode2.dll
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in System.Windows.Forms.dll
A first chance exception of type 'System.ObjectDisposedException' occurred in mscorlib.dll
The program '[0x2C50F9A] MC2180.exe: Managed' has exited with code 0 (0x0).

产生错误的方法如下。此代码段采用条形码并显示产品信息（从Web服务中提取）

案例PANEL_PLU：

                        clearPLUpanel();
                        pluDataPartno.Text = "LOADING"; // This never gets seen - panel doesn't get repainted
                        lblScanBarcode.Hide();
                        panelError.Hide();

                        payload = new Dictionary<String, String>();
                        payload.Add("barcode", scanData.Text);
                        request = new dataRequest("plu",payload);
                        res = dataTransfer.sendRequest(request);

                        if (res.result == "ok")
                        {
                            // We're good, populate and show fields
                            playHappyBeep();
                            pluItem_Id = res.item_id;
                            pluDataPartno.Text = res.item_partno;
                            pluDataName.Text = res.item_name;
                            pluDataFreeStock.Text = res.item_freeStock.ToString();
                            pluDatalAllocated.Text = res.allocated_stock.ToString();
                            pluDataLoc.Text = res.loc_name;
                            pluDataShelfStock.Text = res.item_shelfStock.ToString();
                            pluLabelAllocated.Show();
                            pluLabelFreeStock.Show();
                            pluLabelLoc.Show();
                            pluLabelShelfStock.Show();
                            pluImage.Show();
                            plu_btnChangeLoc.Show();
                            plu_btnAutoLocate.Show();

                            if (res.image_url.StartsWith("http")) {
                                 pluImage.Url = new System.Uri(res.image_url);
                            }

                            if (res.item_freeStock > 0)
                            {
                                pluDataFreeStock.ForeColor = Color.Green;
                            }
                            else
                            {
                                pluDataFreeStock.ForeColor = Color.Red;
                            }

                        }
                        else
                        {
                            playErrorBeep();
                            clearPLUpanel();
                            lblErrorHeadline.Text = res.error_info;
                            panelError.Show();                               
                        }

                        System.Diagnostics.Trace.WriteLine(btn_orderChecking.Font.Style); // This is the line that occasionally throws the exception

                        break;

Answer 1

在OS版本82.34.004中不会发生此错误。您应该将操作系统更新到此版本。昂德里奇

Compact Framework 3.5应用程序丢失字体样式

1 个答案: