[Solved] PropertyGrid with multiple SelectedObjects [modified] - C# Discussion Boards

GenJerDan15-Jun-11 11:30

15-Jun-11 11:30

In addition to the other answers, there is also Convert.ToDateTime(something)

Always nice to know different methods of doing something.

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Re: Convert string to datetime

AspDotNetDev15-Jun-11 11:40

AspDotNetDev

15-Jun-11 11:40

That would not help in this case.

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Re: Convert string to datetime

GenJerDan16-Jun-11 3:18

GenJerDan

16-Jun-11 3:18

Probably not, but I don't know all the possible Culture formats available. There might be one out there who decided to use sensible dates.

Build a man a fire, and he'll be warm for a day.
Set a man on fire, and he'll be warm for the rest of his life.

My Mu[sic]
My Films
My Windows Programs, etc.

Re: Convert string to datetime

V.15-Jun-11 20:04

15-Jun-11 20:04

1. What is the error it gives you
2. Use the TryParseExact function.
3. Read up on MSDN for the format string options[^]

Hope this helps.

Undo changes to context when using EntityFramework 4.0/4.1

MaWeRic15-Jun-11 5:59

MaWeRic

15-Jun-11 5:59

I have Invoice entity wich I change and then add InvoiceRows and then I want to cancel the whole operation.

What is the easiest way of doing this?
I can use Context.refresh() to get a fresh copy of my Entity but is this really the way to do it?

//h

Re: Undo changes to context when using EntityFramework 4.0/4.1

dasblinkenlight15-Jun-11 8:33

dasblinkenlight

15-Jun-11 8:33

I would use Context.Refresh(RefreshMode.StoreWins, obj) as my "Plan B".

My "Plan A" would be keeping changes outside of Context until they are ready to be committed, and then apply and commit them in an atomic operation. This requires more work as you need to track the state of newly added entities, but I think it is worth it, because the approach is cleaner overall.

Re: Undo changes to context when using EntityFramework 4.0/4.1

AspDotNetDev15-Jun-11 9:45

AspDotNetDev

15-Jun-11 9:45

Transaction. I've not worked with them with Entity Framework myself, but that seems like what you want.

Help a brotha out and vote Managing Your JavaScript Library in ASP.NET as the best ASP.NET article of May 2011.

[Solved] PropertyGrid with multiple SelectedObjects [modified]

lukeer15-Jun-11 4:31

lukeer

15-Jun-11 4:31

Hi experts,

there is a PropertyGrid in my application. It shows properties of an object. Some of these properties can hold values that are illegal to business logic. Those values show a warning symbol by using a custom TypeEditor. Mentioned properties are marked by an attribute.

Some of the properties are even linked. Business logic decides whether or not a combination of linked properties is illegal.

To this point all is fine.

Now the PropertyGrid has to show properties of multiple objects and the warning symbols don't work any longer.

This method should tell whether a property can, depending on its value, warn by setting the symbol

public override bool GetPaintValueSupported(System.ComponentModel.ITypeDescriptorContext context)
{
    // First chance: "Invalid" enumeration value
    if (
        context.PropertyDescriptor.PropertyType.IsEnum
        && Enum.IsDefined(context.PropertyDescriptor.PropertyType, "Invalid")
    )
        return(true);

    // Second chance: decorated with WarnableAttribute
    foreach(Attribute attribute in context.PropertyDescriptor.Attributes) //mark
        if(attribute is WarnableAttribute)
            return(true);

    // No support for drawing icon.
    return (false);
}

The marked line fails for multiple objects.context.PropertyDescriptor is a PropertyGridInternal.MergePropertyDescriptor, which is not accessible due to access levels.

How could I test for an icon to be painted?

Edit: It's working now thanks to ITypeDescriptorContext containing an object called instance, which is an Array when selecting multiple objects.
Knowing that, it's possible to check for attributes with some reflection.

Ciao,

luker

modified on Friday, June 17, 2011 3:19 AM

C# webservice

Member 401661615-Jun-11 4:09

Member 4016616

15-Jun-11 4:09

Environment – VS2010, Window 7;iis7.0

We have created a Web service (EDI_Translate) and we are consuming this webservice in C# console application. This console application calls the web service in a loop continuously in different thread. The web server handles the request sequentially (like first in first out) but we want web server to handle the request parallely to boost the performance. What should be done in webservice code or web server in order to handle the request paralley by webservice code .

Ramesh Kumar Singh
Software Engineer
Ness Technologies
India

Re: C# webservice

Not Active15-Jun-11 4:15

Not Active

15-Jun-11 4:15

Without knowing anything at all about what the webservice actually does or how it does it how do you expect anyone to accurately answer this?

I know the language. I've read a book. - _Madmatt

Re: C# webservice

BobJanova15-Jun-11 4:26

BobJanova

15-Jun-11 4:26

Calling the service in a loop sounds pretty serial to me. I suspect that the client is making requests in that form, and the server is not serialising them. Web services are (I think) intrinsically parallel. Try starting two clients and see if they interleave.

Download with httpwebrequest/response and stream

Muli10015-Jun-11 3:32

Muli100

15-Jun-11 3:32

Hello everyone this is my first post Smile | :)

so be gentle.

I've implemented a solution to download file,
the problem is that specific pdf files can't be downloaded with lots of bytes per package therefore I want to decrease the number of packages but in order to reduce the waiting time until download completion I want to download the file in sections which means to download parts of the file simultaneously when I implemented it I got an exception "Stream does'nt support multiple IO accesses" probably I'm doing something wrong can someone tell me what should I correct or how should I do it?

for (int i = 0; i < numberOfParts; i++)
                            {
                                httpRequest.AddRange("splittedDownload",Convert.ToInt32(i * size / 5),Convert.ToInt32((i+1) * size / 5-1));
                                httpResponse = (HttpWebResponse)httpRequest.GetResponse();
                                streams.Add(new MyStream(httpResponse.GetResponseStream(),i+1));
                                IAsyncResult result = streams[i].Input.BeginRead(buffer, 0, paketSize, AsyncDownload, streams[i]);
                            }

Thanks.

Re: Download with httpwebrequest/response and stream

BobJanova15-Jun-11 4:08

BobJanova

15-Jun-11 4:08

You can't read a network stream with random access because the data you are trying to access doesn't exist yet. I don't think HTTP supports downloading files in sections, but I'm not sure about that – it supports starting a download from a particular point (that's how browsers can resume a download so you might be able to fire multiple requests for parts of a file.

Chances are though that the waiting time is to do with your connection speed and not this.

Re: Download with httpwebrequest/response and stream

Muli10015-Jun-11 4:20

Muli100

15-Jun-11 4:20

Thank you for the reply,
I've used AddRange in order to start downloading from specific place I think this is the method in order to do it please correct me if I'm wrong but the first request goes well but when I tried to start the second Async operation I get the exception.

I checked the pdf issue and I can see that I can download rar files in packets of 1024 bytes (I didn't check it with bigger packets) but pdf files are recieved corrupted if I download more than 2 bytes every time so it effects the download speed (the same file with 1024 bytes is downloaded in 26 seconds now with 2 bytes it grows to 37 seconds and this is small file,about 2.5 MB) so I think this is the right solution, can you please tell me what is may be wrong in my code in my last correspondence?

Thank you very much.

Re: Download with httpwebrequest/response and stream

BobJanova15-Jun-11 4:25

BobJanova

15-Jun-11 4:25

The number of bytes you read at a time should not affect the output. You are doing something wrong in your reading code if that is the case (perhaps writing the buffer size, not the actual number of bytes read, at each step). It should be something like

byte[] buf = new byte[buf_size];
int read;
while(0 < read = stream.Read(buf, buf_size)){
 outStream.Write(buf, 0, read);
}

A common mistake is to write buf_size bytes to the output, not read bytes.

2.5MB in 26 seconds is roughly 800kbps, that is quite plausible for a transfer from the public internet.

Re: Download with httpwebrequest/response and stream

Muli10016-Jun-11 0:40

Muli100

16-Jun-11 0:40

Thanks, that was the problem
now I can download the 2.5MB file in about 13 seconds Smile | :)

anyway I would like to know what I did wrong with the download in parts (just to learn for the next time) but its not that urgent anymore.

Thank you very much Smile | :)

How to Create Zoom In/Out for Text

Anubhava Dimri15-Jun-11 2:16

Anubhava Dimri

15-Jun-11 2:16

Hello Everybody,

I am drawing text, rectangle and Line. In which have i am tring to zoom Text but i m confused how to zoom text as per as zoom level.

Eg : Rectangle r = new Rectangle (x,y,width * zoomlevel,height * zoomlevel);

How to Zoom Text for ZoomLevel.

Thanks

If you can think then I Can.

Re: How to Create Zoom In/Out for Text

BobJanova15-Jun-11 3:09

BobJanova

15-Jun-11 3:09

You need to create a scaled version of the text's font.

Re: How to Create Zoom In/Out for Text

OriginalGriff15-Jun-11 3:27

OriginalGriff

15-Jun-11 3:27

The easiest way to do this is very simple: apply a Scaling factor to the graphics object you are drawing on. Create a Panel, and two buttons, then handle the appropriate events:

float sx = 1.0F;
float sy = 1.0F;
Font font = new Font("Verdana", 10.0F);
private void panel1_Paint(object sender, PaintEventArgs e)
    {
    Graphics g = e.Graphics;
    g.ScaleTransform(sx, sy);
    g.DrawRectangle(Pens.Blue, new Rectangle(50,50,150, 150));
    g.DrawLine(Pens.Red, 0,0, 200,200);
    g.DrawString("Hello there this is text", font, Brushes.Green, new Point(20,20));
    }

private void butZoomIn_Click(object sender, EventArgs e)
    {
    sx *= 2;
    sy *= 2;
    panel1.Invalidate();
    }

private void butZoomOut_Click(object sender, EventArgs e)
    {
    sx /= 2;
    sy /= 2;
    panel1.Invalidate();
    }

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Manfred R. Bihy: "Looks as if OP is learning resistant."

Re: How to Create Zoom In/Out for Text

BobJanova15-Jun-11 4:05

BobJanova

15-Jun-11 4:05

Oh, good call, I forgot about that.

Is it possible to change the remote SQL Server Job Start time in C#

Vimalsoft(Pty) Ltd14-Jun-11 23:19

Vimalsoft(Pty) Ltd

14-Jun-11 23:19

Good Day all

i have a SQL Job and i want to change the times in the job programmatically from C#. The application that will change the Job Settings will be accessing the job remotely.

Is is possible ?

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: Is it possible to change the remote SQL Server Job Start time in C#

Blue_Boy14-Jun-11 23:35

Blue_Boy

14-Jun-11 23:35

Just curious, same question you asked here[^]

Wink | ;)

I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.

www.cacttus.com

Re: Is it possible to change the remote SQL Server Job Start time in C#

Vimalsoft(Pty) Ltd15-Jun-11 3:24

Vimalsoft(Pty) Ltd

15-Jun-11 3:24

Yes you are right, this is because i want to see different types of View from different type of People. its not like i posted the same question in the same website.

Re: Is it possible to change the remote SQL Server Job Start time in C#

Blue_Boy15-Jun-11 4:01

Blue_Boy

15-Jun-11 4:01

Vuyiswa Maseko wrote:
its not like i posted the same question in the same website.

Yes, I agree.

I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.

www.cacttus.com

Re: Is it possible to change the remote SQL Server Job Start time in C#

jschell15-Jun-11 9:01

jschell

15-Jun-11 9:01

You mean when it is scheduled to run?

Are you writing a SQL management tool? If not I don't see the point.

The point of having a scheduled job is to schedule it because it isn't dynamic (relatively speaking). And there are other ways to deal with dynamic problems.

I am rather certain you can create jobs via some API though. That would include setting the times. I would google for it.

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