Re: wpf - C# Discussion Boards

Re: creating dynamic crystal reports

swapna shanker21-Nov-06 0:16

swapna shanker

21-Nov-06 0:16

ujyuyu

Re: creating dynamic crystal reports

ed^nrgc21-Nov-06 1:47

ed^nrgc

21-Nov-06 1:47

By dynamic, do you mean a report that varies in parameters, or run a report based on parameters?

COM/NET Interop / .NET class as coclass

klanglieferant21-Nov-06 0:07

klanglieferant

21-Nov-06 0:07

Hiya!
It's quite easy to expose an interface of a .NET class to the COM world and to use it (via the COM callable wrapper (CCW), tlbexp.exe etc..). All examples for the unmanaged client, I found so far, using the ::CoCreateInstance or similar, which creates always a new .NET object.

It there a way to register my active .NET class as running object in the ROT and using ::GetActiveObject from my unmanaged code ?
The problem is the .NET implementation has no true access to the CCW..

COM has the concept of "Get-Existing-COM-object" object or "singleton COM".. where's this gone in the .NET interop ??

Thanks!
Rose | [Rose]

Get Current Method's parameter values as collection with reflection(?)

MihaiChioariu20-Nov-06 23:50

MihaiChioariu

20-Nov-06 23:50

Hi y'all .. I hope this is an interesting one ...

Within an executing method, I can call MethodBase.GetCurrentMethod() and
retrieve info about the method that's currently running, including parameter
names & data types.

Is there a way to get the parameter v a l u e s as well ??? ( I know ...
this is indeed weird, but ... )

Thanks,
Mihai

Re: Get Current Method's parameter values as collection with reflection(?)

klanglieferant20-Nov-06 23:56

klanglieferant

20-Nov-06 23:56

aren't you in the method-call anyway ? you've got the value of the parameters already..

wpf

amin saffari20-Nov-06 23:47

amin saffari

20-Nov-06 23:47

whwt is wpf and is it related to 3d in c#?

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Re: wpf

ed^nrgc21-Nov-06 1:51

ed^nrgc

21-Nov-06 1:51

Yes, it is related to C# 3.0

http://msdn.microsoft.com/windowsvista/experience/#wpfpt

Re: wpf

Daniel Grunwald21-Nov-06 4:08

Daniel Grunwald

21-Nov-06 4:08

It's not related to C# 3.0. Don't confuse C# 3.0 with .NET 3.0 - .NET 3.0 and WPF are already released, but C# 3.0 will come later (with .NET 3.5), it's main feature is integration of (database/XML/etc) queries into C#.

Streaming a dataset

zenithmaximus20-Nov-06 23:12

zenithmaximus

20-Nov-06 23:12

Hi all,

I have a MS Access Database and i want to programmatically transfer it to a csv file...
how can i stream the dataset that has the data from MS Access database and write it to csv file?

Thanks in advance.

-::maximus::-

Re: Streaming a dataset

ed^nrgc21-Nov-06 1:53

ed^nrgc

21-Nov-06 1:53

Search CodeProject real hard did ya? Sigh | :sigh:

http://www.codeproject.com/aspnet/ImportExportCSV.asp

ques: what does a dataset returns ?

ashu.singh20-Nov-06 23:02

ashu.singh

20-Nov-06 23:02

Hi,

i am new to coding in .net.i was trying to catch dataset from a function.my ques. is
What does dataset returns when no rows are selected in it?
also
how can i use this it on right hand side of exp. in a if construct?
iam coding in c#.

thanks in advances.

Re: ques: what does a dataset returns ?

Christian Graus20-Nov-06 23:18

Christian Graus

20-Nov-06 23:18

It returns an empty dataset, probably with one empty table in it. It will work fine, and just render nothing.

Christian Graus - C++ MVP

Re: ques: what does a dataset returns ?

ashu.singh21-Nov-06 19:53

ashu.singh

21-Nov-06 19:53

thanks chris
can u send me some ebooks on c#.net.

Re: ques: what does a dataset returns ?

Christian Graus21-Nov-06 20:03

Christian Graus

21-Nov-06 20:03

No. Books cost money, go buy some.

Christian Graus - C++ MVP

Re: ques: what does a dataset returns ?

Nidhi.s21-Nov-06 3:19

Nidhi.s

21-Nov-06 3:19

If No rows in dataset it will return a empty table.
Accessing the dataset table:
ds.Tables[0];
ds.Tables[0].Rows[index][columnName];

Re: ques: what does a dataset returns ?

ashu.singh21-Nov-06 19:27

ashu.singh

21-Nov-06 19:27

hi

thanks for the reply.
ashu

how can we bind datagrid with custom collection

333soori20-Nov-06 22:40

333soori

20-Nov-06 22:40

hi frends........

can anybody help me

how to bind custom collection to a datagrid

thanks in advance

soori

soori

Re: how can we bind datagrid with custom collection

Christian Graus20-Nov-06 22:58

Christian Graus

20-Nov-06 22:58

By setting the data source of the data grid.

Christian Graus - C++ MVP

Re: how can we bind datagrid with custom collection

333soori20-Nov-06 23:34

333soori

20-Nov-06 23:34

sorry thats not my question

wht is custom collection?how can we do that.

soori

Re: how can we bind datagrid with custom collection

A T I F21-Nov-06 2:57

A T I F

21-Nov-06 2:57

Although the question is very vague on what you want to do let see if this helps.

You can create a custom collection by implementing IList, IEnumerable etc interfaces or extending a CollectionBase class to store whatever object you want to specialize to.

In order to sent a Custom Collection to a DataGrid it should be one of the following

A DataTable
A DataView
A DataSet
A DataViewManager
Any component that implements the IListSource interface
Any component that implements the IList interface

CustomCollection implements IList interface so it will work as a DataSource to DataGrid. Hope this helps.

Converting image to Base64?

Support12320-Nov-06 22:14

Support123

20-Nov-06 22:14

Hi All,

Please could someone give me a code snippet on how to convert an image into Base64. I think i could use it in this segment myXmlTextWriter.WriteElementString("ImagePath", Convert.ToString(ps.ImagePath)); , Convert the image into Base64 in C# before writing it into xml file. The reason why i need to do this is to embed an image into the xml so that it is embedded into my HTML after the xslDoc.Transform(xmlPath, ExamplePath+"\\Example.html",resolver); .

Actually you can display base-64 images inline, using the data url format -
see the spec. at http://www.ietf.org/rfc/rfc2397.txt[^] .

I read up on this topic and came across the following: <IMG SRC="data:image/gif,base64;[...]">where the [...] contains your base-64
string

"Many of life's failures are people who did not realize how close they were to success when they gave up." Thomas A. Edison

Re: Converting image to Base64?

Guffa20-Nov-06 23:44

Guffa

20-Nov-06 23:44

If you have an Image object, save it to a MemoryStream to get a byte array.

If you have an image file, load it into a byte array.

Use the Convert.ToBase64String method to make the conversion.

---
b { font-weight: normal; }

Re: Converting image to Base64?

Support12321-Nov-06 0:02

Support123

21-Nov-06 0:02

Hi,

I came across this example...

//Serialization: image to XML (base64)<br />
	Image srcImage = new Bitmap(txtGIFImageFile.Text);<br />
	MemoryStream memStream = new MemoryStream();<br />
	srcImage.Save(memStream, System.Drawing.Imaging.ImageFormat.Gif);<br />
<br />
	StringBuilder strBuilder = new StringBuilder();<br />
	StringWriter writerSerialized = new StringWriter(strBuilder);<br />
	XmlTextWriter writerXMLText = new XmlTextWriter(writerSerialized);<br />
<br />
	XmlSerializer serializerXML = new XmlSerializer(memStream.GetBuffer().GetType());<br />
	serializerXML.Serialize(writerXMLText, memStream.GetBuffer());<br />
	<br />
	writerXMLText.Close();<br />
	txtSerializedText.Text = strBuilder.ToString();

would it be possible to insert a path with the file name (like for example: "C:\img\img123.jpg" ) in the Image srcImage = new Bitmap(txtGIFImageFile.Text); part?

Thank you in advance.
Nico

"Many of life's failures are people who did not realize how close they were to success when they gave up." Thomas A. Edison

Re: Converting image to Base64?

Guffa21-Nov-06 0:31

Guffa

21-Nov-06 0:31

NarutoFan#1 wrote:
would it be possible to insert a path with the file name (like for example: "C:\img\img123.jpg" ) in the Image srcImage = new Bitmap(txtGIFImageFile.Text); part?

I take it that you have no clue how the code really works?

The new Bitmap() part is loading the image from the file specified in the text box. Of course you can use any string you like instead of reading a string from a text box.

Are you going to convert the image from one format to anohter? Otherwise there is no reason to load the image and then save it again.

---
b { font-weight: normal; }

Re: Converting image to Base64?

Support12323-Nov-06 3:48

Support123

23-Nov-06 3:48

Yes, i need to convert the image to Base64, this is the format i operantly need to be able to embed an image into the xml to be able to embed it in the html.

"Many of life's failures are people who did not realize how close they were to success when they gave up." Thomas A. Edison

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