MCPD单项选择题每日一练(2019.01.22)

单项选择题
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Web form and add the following code fragment： <asp：Repeater ID="rptData" runat="server" DataSourceID="SqlDataSource1" ItemDataBound="rptData_ItemDataBound"> <ItemTemplate> <asp：Label ID="lblQuantity" runat="server" Text=’<%# Eval（"QuantityOnHand"） %>’ /> </ItemTemplate> </asp：Repeater> The SqlDataSource1 DataSource control retrieves the Quantity column values from a table named Products. You write the following code segment to create the rptData_ItemDataBound event handler： 01 protected void rptData_ItemDataBound（object sender， 02 RepeaterItemEventArgs e） 03 { 04 ► 05 if（lbl != null） 06 if（int.Parse（lbl.Text） < 10） 07 lbl.ForeColor = Color.Red； 08 }You need to retrieve a reference to the lblQuantity Label control into a variable named lbl. Which code segment should you insert at line 04？（）
A.Label lbl = Page.FindControl("lblQuantity") as Label;
B.Label lbl = e.Item.FindControl("lblQuantity") as Label;
C.Label lbl = rptData.FindControl("lblQuantity") as Label;
D.Label lbl = e.Item.Parent.FindControl("lblQuantity") as Label;
单项选择题
You are developing a Windows Azure application in which a web role and worker role will communicate by using a Windows Azure Queue. You need to recommend an approach for ensuring that the worker role does not attempt to process any message more than three times. What should you recommend？（）
A. Appropriately handle poison messages.
B. Decrease the visibility timeout for messages.
C. Reduce the time-to-live interval for messages in the queue.
D. Increase the number of worker role instances reading messages from the queue.
单项选择题
You need to write a code segment that transfers the first 80 bytes from a stream variable named stream1 into a new byte array named byteArray.You also need to ensure that the code segment assigns the number of bytes that are transferred to an integer variable named bytesTransferred.Which code segment should you use?（）
A.bytesTransferred=stream1.Read（byteArray，0，80）；
B.
C.
D.
单项选择题
You are creating a Windows Forms application for a courier company by using the .NET Framework 3.5.You create a form that allows customers to track the progress of their shipments.The form contains the following elements：（1）A text box named txtTN that allows users to enter a tracking number. （2）An ErrorProvider control named ErrorProvider1 that informs users of an invalid tracking number. （3）A function named ValidTrackingNumber that validates tracking numbers. You need to ensure that the txtTN text box is validated. Which code segment should you use？（）
A.A
B.B
C.C
D.D
单项选择题
You use Microsoft .NET Framework 4 to create an application. The application performs resource-intensive calculations that consist of multiple layers of nested looping.The application will be deployed to servers that contain varying hardware configurations. You need to ensure that the application utilizes CPU resources on the server in the most efficient manner. You want to achieve this goal by using the minimum amount of code. What should you do?（）
A. Use multiple System.Threading.Thread objects.
B. Use the background worker process (BWP).
C. Use the Thread.BeginInvoke method.
D. Use the Parallel.For method.