Re: Delegate w/ Lambda - C# Discussion Boards

Dave Kreskowiak15-Aug-12 8:14

15-Aug-12 8:14

You have to declare the Test method as "static", just like your Main method.

Either that, you have to new up an instance of the Program class and use the Test method through that.

Serisouly, this is C# 101 stuff. You really need to pick up a beginners book on C# and work through it.

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Dave Kreskowiak

Re: Having Problem with small Function

computerpublic15-Aug-12 9:06

computerpublic

15-Aug-12 9:06

I am using the a book and I am following the example. I don't know why I am getting the error.

Re: Having Problem with small Function

Wes Aday15-Aug-12 9:43

Wes Aday

15-Aug-12 9:43

Look up the keyword "static", as that is why you are getting that particular error.

Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
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Re: Having Problem with small Function

harold aptroot15-Aug-12 10:20

harold aptroot

15-Aug-12 10:20

You're trying to call an instance method on an implicit this, but Main is static so there is no this.

Re: Having Problem with small Function

Bernhard Hiller15-Aug-12 22:54

Bernhard Hiller

15-Aug-12 22:54

The function "Main" is the start point of the program. When "Main" is called, no instance of any object could yet be created, hence it must be static.
From a static method, you can reach other static methods. Or you can create an object. When you create a e.g. new Windows Forms application in Visual Studio, it adds a line to Main: Application.Run(new Form1());. This creates a new object of type Form1.
Similarly, you could write another class, create the corresponding object, and call its function, e.g.

namespace Testing_Functions
{
    class Addition
    {
        public Double Test(Double Val1, Double Val2, Double Val3)
        {
            Double Test_Val = Val1 + Val2 + Val3;
            return Test_Val;
        }
    }
}

and then call it from your Main method:

Addition a = new Addition();
Double Result = a.Test(A,B,C);

Re: Having Problem with small Function

DaveyM6916-Aug-12 1:37

DaveyM69

16-Aug-12 1:37

I think it's been explained pretty well already, but just in case...

static methods are available without an instance of the class. Non static methods are only available through an instance of the class.

This gives you two options in your case. Either
1. Make the Test method static

public static Double Test(Double Val1, Double Val2, Double Val3)

or

2. Create a new instance of the class that holds the method (Program in this case).

Double Result = new Program().Test(A,B,C);

alternative

Program program = new Program();
Double Result = program.Test(A,B,C);

Dave

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.
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Delegate w/ Lambda

Herrwolf115-Aug-12 4:43

Herrwolf1

15-Aug-12 4:43

What is the C# equivalent to the following VB.NET code?

Delegate Sub SetStatus(ByVal Text As String)

Private Sub SetStatusStrip(ByVal Text As String)
    Dim d As New SetStatus(Sub()
        ' Do some work.
        End Sub)
    Me.Invoke(d, New Object() {Text})
End Sub

Re: Delegate w/ Lambda

BobJanova15-Aug-12 5:04

BobJanova

15-Aug-12 5:04

This seems homeworky but since you could just whip it through an autotranslater anyway, here you go:

delegate void SetStatus(string text);

private void SetStatusStrip(string text){
 Invoke(text => {
     // do some work
   }, new object[] { text } );  
}

I think that's right. Invoke is a bit sniffy sometimes, you might need to cast the lambda, but I don't think so. Although it seems like the VB method you're generating for the delegate doesn't actually use a parameter so there's no reason you need to use that delegate for the inner method.

Re: Delegate w/ Lambda

Eddy Vluggen15-Aug-12 5:19

Eddy Vluggen

15-Aug-12 5:19

Doesn't sound like homework to me; I don't know any schools that mix VB/C#, but I do know that managers "insist" on keeping their codebase in a single language Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: Delegate w/ Lambda

Herrwolf115-Aug-12 8:54

Herrwolf1

15-Aug-12 8:54

I assure you it's not homework. I've been programming (promoted from drafting) for about three years. I started in VB.Net and am now trying to convert to C#. That doesn't seem to work. How can I cast a lambda expression? Thanks for the auto translate idea. I ran the code through a couple and none seem to work. Thanks for your help.

Re: Delegate w/ Lambda

Dave Doknjas15-Aug-12 10:21

Dave Doknjas

15-Aug-12 10:21

internal delegate void SetStatus(string Text);

private void SetStatusStrip(string Text)
{
	SetStatus d = new SetStatus(() => {
		// Do some work.
		});
	this.Invoke(d, new object[] {Text});
}

David Anton
Convert between VB, C#, C++, & Java
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Re: Delegate w/ Lambda

Herrwolf115-Aug-12 10:54

Herrwolf1

15-Aug-12 10:54

Thank you sir. The following is what I ended up using and it works great.

SetStatus d = new SetStatus( (string myText) =>
        {
            // Do some work
        });
        this.Invoke(d, new object[] { _text });

Sending SMS through ASP.NET

komalridda14-Aug-12 20:00

komalridda

14-Aug-12 20:00

I want to send sms through asp.net. Can anybody give me working code please.I want it urgent Frown | :(

Re: Sending SMS through ASP.NET

OriginalGriff14-Aug-12 20:42

OriginalGriff

14-Aug-12 20:42

So urgently you can't be bothered to use Google?

A very quick search, copied directly from your question gave 42 million hits, most of them with source code.

https://www.google.co.uk/search?q=send+sms+through+asp.net&sugexp=chrome,mod=10&sourceid=chrome&ie=UTF-8[^]

In future, please try to do at least basic research yourself, and not waste your time or ours.

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Cross Post

DaveyM6914-Aug-12 23:24

DaveyM69

14-Aug-12 23:24

This has been posted in the .NET forum and (correctly) int the ASP forum.

Re: Sending SMS through ASP.NET

Keith Barrow15-Aug-12 2:08

Keith Barrow

15-Aug-12 2:08

You've posted this in 3 different forums, and the answer is easily Googled.

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-Or-
A Dead ringer for Kate Winslett[^]

Save Excel File

Member 916988714-Aug-12 15:21

Member 9169887

14-Aug-12 15:21

How can I save an Excel file which will prompt user to select where to save? What save mode should I use?

Re: Save Excel File

Dave Kreskowiak14-Aug-12 18:13

Dave Kreskowiak

14-Aug-12 18:13

More detail is needed.

Is this a web app? WinForms? Excel VBA code? What?

How are you generating the workbook to "save"??

There's no such thing as a "save model". Your use of the term could mean anything.

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Dave Kreskowiak

modified 15-Aug-12 8:06am.

Re: Save Excel File

Eddy Vluggen15-Aug-12 1:23

Eddy Vluggen

15-Aug-12 1:23

Prompting the user for a save-location is done using the standard SaveFileDialog. It doesn't matter what type of file you want to save, the dialog is always the same.

Check out the documentation[^].

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

About SerialPort

SODMi14-Aug-12 15:18

SODMi

14-Aug-12 15:18

Ladies And Gentlemen:
Here I use a SerialPort to send and receive message(of Bytes).
But it cannot really work.
MCU can send a string to PC, and PC can send a string to MCU too.
The problem is , when PC sent a string first,later when you about to send a string to PC from MCU ,it losts a byte,the first or the second one.

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    //lock1.AcquireWriterLock(-1);
    int temp = serialPort1.ReadByte();

    //Console.WriteLine("temp是：" + temp);

    //验证是否是合法地址
    if (IsAddrConfirmed == 0 && NeedAddrConfirm == 1)
    {
        IsAddr = confirmAddr((byte)temp);
        IsAddrConfirmed = 1;
        ////Console.WriteLine("地址已经验证:"+CurrentAddr);
    }

    //if (temp != 63 && !IsAddr && AddrBacked_2 == 1)
    if (!IsAddr && AddrBacked_2 == 1)
    {
        try
        {
            textBox3.Text += "temp是：" + temp + "\r\n";
            //textBox3.Text += "收到字符串：" + serialPort1.ReadLine()+"\r\n";
            textBox3.Text += "收到字符串：" + (char)temp + serialPort1.ReadLine() + "\r\n";

When dataReceived,temp got a value
Look at the last two or three lines ,is it the point?
Thank you very much,but sorry for my bad English.

Little bird looking for heros

Re: About SerialPort

Roger Wright14-Aug-12 20:08

Roger Wright

14-Aug-12 20:08

You're right, the English is rough, but we'll work through that... The sample code is interesting, but far too little to make an educated guess. The non-English characters are confusing to us, but to a serial port, bytes is bytes - it doesn't care. There's a clue in the fact that the first couple of bytes are being lost, I think. The fact that you get any meaningful data at all indicates that you have the baud rate set correctly, so we can forget that. But the handshaking might be mismatched. The PC port and the MCU port must be set to use the same protocol in order to properly sync the messages. Modern PCs will attempt to auto-negotiate handshaking if the mode is set to 'none', I believe, but MCUs aren't as sophisticated. Confirm that the handshaking protocols are identical.

Another possibility is that you (or the MCU) are expecting to have the PC's undivided attention to the data stream incoming on the serial port. That's not the case with a multi-tasking OS like Windows. You'll want to dedicate a thread to listening on the serial port with a fairly high priority in order to catch the leading bits of a randomly-generated message from the MCU. If you don't, Windows may be off doing something else when the first couple of bytes arrive, and they'll be lost.

Post a bit more of your code so that we can see what you've set up the system to do, and feel free to post the MCU code, as well. It helps to see what both sides of the conversation are expecting from each other. I know that serial communications is old and well established, but it's quirky at best, and the "standard" isn't too well enforced. Every bit of information you can provide will be helpful.

Will Rogers never met me.

Web Scraping XML file

mjackson1114-Aug-12 8:23

mjackson11

14-Aug-12 8:23

I am trying to scrape a web page. The URL is

http://reports.ieso.ca/public/GenOutputCapability/PUB_GenOutputCapability.xml

If I open the link in a browser window there is information about when the report was created, totals, etc. If I scrape the URL from C# using a WebClient or WebRequest, only the XML file is returned. It appears that much of the information on the page is stored in a dymanically created style sheet on their web site.

Is there a way to use a WebClient or WebRequest to get exactly what I see on the web page?

Thanks,

Mark Jackson

Re: Web Scraping XML file

PIEBALDconsult14-Aug-12 9:53

PIEBALDconsult

14-Aug-12 9:53

Dunno. Maybe try the WebBrowser control and check its document property.

Re: Web Scraping XML file

Dave Kreskowiak14-Aug-12 18:10

Dave Kreskowiak

14-Aug-12 18:10

Some idiot voted you a 1 for a perfectly reasonable answer.

Countered.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Web Scraping XML file

PIEBALDconsult15-Aug-12 3:26

PIEBALDconsult

15-Aug-12 3:26

Oh, thanks. Thumbs Up | :thumbsup:

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