C# Discussion Boards - CodeProject

DataGridView - combobox as a column

17-Aug-07 0:29

i have 3 different applications
i want a single setup project for all the three applications

three applications are different
1)windows application
2)web application
3)web application

drweb8617-Aug-07 0:22

drweb86

17-Aug-07 0:22

Hi, all

I have a question about using DataGridView.

Could you write me a code sample how to get and set SelectedItem in Combobox column in DataGridView

Here is the code i use to create a new row

DataGridViewCell dgvc = datagrid.Columns[0].CellTemplate;
datagrid.Rows[index].Cells[0].Value = dgvc;

in CellTemplate two items
Fast
Slow

and it's not clear for me how to set 'Slow' item programmatically

i've tried
((ComboBox)(datagrid.Rows[index].Cells[0].Value)).SelectedIndex = 1;
((ComboBox)(dgvr.Cells[0].Value)).SelectedIndex = 1;
((DataGridViewComboBoxCell)(datagrid.Rows[index].Cells[2].Value)).SelectedIndex = 1;

but it throws exceptions

What should i do?

uploading xml to database

kalyan_241617-Aug-07 0:15

17-Aug-07 0:15

hi
i can upload my xml into database easily

but i am getting a problem when the xml tag is a keyword(like desc,double)

saying syntax error in insert into command....

in general insert if keyword canbe changed like [keyword]

but i am not coming accross insert statement when i am using da.update(table)
please help me

Rocky#17-Aug-07 0:54

Rocky#

17-Aug-07 0:54

plz give some code and show us how ur inserting the data

Rocky

You can't climb up a ladder with your hands in your pockets.

Follow this rule

Arrive. RAISE HELL. Leave.

kalyan_241617-Aug-07 0:56

17-Aug-07 0:56

have an xml
i am able to change into data table
and insert into database also...

StringReader xmlsr3 = new StringReader(region);
dset3.ReadXml(xmlsr3, XmlReadMode.IgnoreSchema);
OleDbDataAdapter da3 = new OleDbDataAdapter("select * from drregion", m_Conn);
OleDbCommandBuilder cb3 = new OleDbCommandBuilder(da3);
da3.Update(dtab3); dtab3 = dset3.Tables[0];

like this it gets updated
now the problem is when xml string has a keywords (of databases)
while updating into database that is in the last statement
there is an error saying insert into syntax error
i need to change the
ex: keyfield-desc
to [desc] (i could nt do it in xml ) there was another error if i do that
how can i do this
or is there any other way....

Rocky#17-Aug-07 1:08

Rocky#

17-Aug-07 1:08

OK so your problem is that you need to enclose the keywords of databases with [] brackets right!

I'm giving you an idea, go ahead and try it out

store all the available keywords in an string array.
then parse the xml you need to insert comparing them with the contents of the array. if you get a match you shuld enclose the matched word with []

when youre done with that, just do whatever you wanna do OK

as far as my understanding is concerned its really a string manipulation problem.

Rocky

You can't climb up a ladder with your hands in your pockets.

kalyan_241617-Aug-07 1:13

17-Aug-07 1:13

when i do that
what is happening is
StringReader xmlsr3 = new StringReader(region);
dset3.ReadXml(xmlsr3, XmlReadMode.InferSchema);
an exception rises saying its a "[" cannot be used here

Rocky#17-Aug-07 1:25

Rocky#

17-Aug-07 1:25

hmm well in taht case i think we do have a little situation here. calling an XML experienced customer here!!

Rocky

You can't climb up a ladder with your hands in your pockets.

kalyan_241617-Aug-07 1:29

xml serialization for multiple arraylists

17-Aug-07 1:29

kkkkkk
thanxs

cyn817-Aug-07 0:13

17-Aug-07 0:13

hi,
i'm new to xml serialization. I was wondering how to serialize and deserialize a few('more than 1')arraylists. Another thing is that one of the arraylist consist of a list graphicspaths. I manage to accomplish this same task using binary serialization. However, now i want to learn on how to do this using xml serialization. Can anybody help? I can't seem to find much information about it.

Thanks in advance.

Giorgi Dalakishvili17-Aug-07 0:39

Giorgi Dalakishvili

17-Aug-07 0:39

Do you want to serialize array of arraylists? As far as I remember xml serialization doesn't support serializing graohicspaths (But I'm not sure) If arraylist doesn't contain some complex type that can't be serialized by xml serialization then you can serialize it very easily. Here are some links to get you started:
xml serialization[^]

Serialize Arrays and ArrayLists to XML[^]

#region signature
my articles
#endregion

cyn819-Aug-07 16:53

Re: xml serialization for multiple arraylists [modified]

19-Aug-07 16:53

Actually i have a few arraylist which each contains different types or classes. Last time u use binary serialization, i can serialize each or the arraylist separately. e.g:

<br />
<br />
formatter.Serialize(myStream, arr1)<br />
formatter.Serialize(myStream, arr2)<br />
formatter.Serialize(myStream, arr3)<br />
<br />
<br />
<br />
//To restore the arraylists, make the calls to formatter.Deserialize in the //exact same order:<br />
<br />
arr1 = (ArrayList) formatter.Deserialize(myStream);<br />
arr2 = (ArrayList) formatter.Deserialize(myStream);<br />
arr3 = (ArrayList) formatter.Deserialize(myStream);<br />
<br />
<br />

However, does this concept applies with xml serialization?
Also, by looking at the examples given, it seems that for each arraylist i need to create a class each? If it is so, which class should is labelled as "XmlRoot"? if not mistaken, in an XML file there should have only one root. however, from my perspective, all of the arraylist should be xmlelements. Am i right?

Thanks in advance.

Hessam Jalali17-Aug-07 4:02

Hessam Jalali

17-Aug-07 4:02

Hi Cyn8

I said how you can serialize graphicPaths (if you had problem with it just tell me) before and about the arraylists you can just create a new Class that contains those data (is much better) like collection or just simply put your arrayLists niside another one and serialize that (I think I said these before too)

but if you mean SOAP serializtion which give you the xml file just simply use SOAPFormatter Class instead of BinaryFormatter class and you don't need to change your code but as I know Xmls from SOAP are not such a readable ones So if you need to Save your data which be easily readable you can use xml.serializations which Giorgi Dalakishvili sent you some cool links about that or just create your custom data saver with xml classes if your datas are not such complex

and at last for using SOAPFormatter you must add it as reference

best regards

-- modified at 10:07 Friday 17th August, 2007

Re: xml serialization for multiple arraylists [modified]

cyn819-Aug-07 16:43

19-Aug-07 16:43

hi there,
With your help last time, i've manage to use binary serialization to serialize and deserialize the arraylists Smile | :)

However, now i have abit problem with xml.serializations. Looking at the examples given, it seems that for each arraylist i need to create a class each? If it is so, which class should is labelled as "XmlRoot"? in an XML file there should have only one root and can have many elements right? Sorry if i still don't quite understand.

Besides, i try to modify the codes by replacing all the functions that uses binary formatter to xml serializer, which does not works as shown below.

XmlSerializer s = new XmlSerializer( typeof(ArrayList) );<br />
		private ArrayList alDrawingObjects = new ArrayList();<br />
		public ArrayList CoordList=new ArrayList (); <br />
		public ArrayList ShapeTypeList=new ArrayList (); <br />
		public ArrayList ColorList=new ArrayList ();<br />
		public ArrayList PolyCoord = new ArrayList();<br />
		public ArrayList SizeList = new ArrayList();

Serializing:

Stream myStream ;<br />
					myStream = File.OpenWrite(filename);<br />
					ArrayList arr = new ArrayList();<br />
					if (myStream != null)<br />
					{<br />
						<br />
						TextWriter w = new StreamWriter( filename );<br />
						s.Serialize( w, ShapeTypeList );<br />
						s.Serialize( w, ColorList );<br />
						s.Serialize( w, CoordList);<br />
						s.Serialize( w, SizeList );<br />
<br />
						for(int i=0;i<PathList.Count;i++)<br />
						{<br />
							GraphicsPathData gpd = new GraphicsPathData((GraphicsPath)PathList[i]);<br />
							Stream gpdStream = GraphicsPathData.Serialize(gpd);<br />
							arr.Add(gpdStream);<br />
					 <br />
						}<br />
						s.Serialize( w, arr);<br />
<br />
						w.Close();

Deserializing:

ArrayList newList;<br />
					TextReader r = new StreamReader(filename);<br />
					ShapeTypeList = (ArrayList) s.Deserialize(myStream);<br />
					ColorList = (ArrayList) s.Deserialize(myStream);<br />
					CoordList = (ArrayList)s.Deserialize(myStream);<br />
					SizeList = (ArrayList) s.Deserialize(myStream);<br />
					arr=(ArrayList) s.Deserialize(myStream);<br />
					for(int i=0;i<arr.Count;i++)<br />
					{<br />
						Stream newStream = new MemoryStream(((MemoryStream)arr[i]).ToArray());<br />
						GraphicsPath gpDeserialized = GraphicsPathData.GetGraphicsPath(newStream);					<br />
						PathList.Add(gpDeserialized); <br />
					}<br />
					myStream.Close();	<br />
					r.Close();

Please help to explain on which part i should change?
Thanks again.

-- modified at 2:42 Monday 20th August, 2007

cyn819-Aug-07 19:00

19-Aug-07 19:00

if i put the all arraylists into another arraylist, when i deserialize them, how do i deserialize them into the original arraylist?

Thanks for any reply Smile | :)

Hessam Jalali19-Aug-07 22:16

Hessam Jalali

19-Aug-07 22:16

I think the best way to do this is to create a new class for holding whole of your data. about the GPD you used in the code ,as a tip holding serialized streams is not a good choice ,I think you can serialize whole of your GPDs together (because they are marked as serializable)

and in the code you put all your data in one stream ,retrieving from it is not impossible but is far more harder than use a new class to hold all of your data

here is the scheme of such a class (it has some works to be a complete one)

<code>
        [XmlRoot("MyData")]
        [Serializable]
        class MyData
        {
//it seems datas in each arraylist are the same type so if you're codinh in .NET2.0 or above use List<> instead of ArrayList

            ArrayList shapeTypeList;
            ArrayList colorList;
            ArrayList coordList;
            ArrayList sizeList;

            ArrayList graphicsPathDataList;

            [XmlArray("ShapeData")]
            [XmlArrayItem("Shape",typeof(/*you must get the type here*/))]
            public ArrayList ShapeTypeList
            {
                get { return this.shapeTypeList; }
            }

            [XmlArray("ColorData")]
            [XmlArrayItem("Color",typeof(/*you must get the type here*/))]
            public ArrayList ColorList
            {
                get { return this.colorList; }
            }

            [XmlArray("CoorinationData")]
            [XmlArrayItem("Coordination",typeof(/*you must get the type here*/))]
            public ArrayList CoordList
            {
                get { return this.coordList; }
            }

            [XmlArray("SizeData")]
            [XmlArrayItem("Size",typeof(/*you must get the type here*/))]
            public ArrayList SizeList
            {
                get { return this.sizeList; }
            }

            [XmlArray("GPDData")]
            [XmlArrayItem("GPD",typeof(/*you must get the type here*/))]
            public ArrayList GraphicsPathDataList
            {
                get { return this.graphicsPathDataList; }
            }

            public MyData(ArrayList shape, ArrayList color, ArrayList coord, ArrayList size, ArrayList gpd)
            {
                this.shapeTypeList = shape;
                this.colorList = color;
                this.coordList = coord;
                this.sizeList = size;
                this.graphicsPathDataList = gpd;
            }

            static MyData BinLoad(string path)
            {
                BinaryFormatter binSer=new BinaryFormatter();
                FileStream fo=new  FileStream(path,FileMode.Open);

                object data=binSer.Deserialize(fo);
                fo.Close();

                return data as MyData;
            }

            void BinSerialize(string path)
            {
                BinaryFormatter binSer=new BinaryFormatter();
                FileStream fo=new  FileStream(path,FileMode.OpenOrCreate);

                binSer.Serialize(fo,this);
                fo.Close();
            }

            static MyData XmlLoad(string path)
            {
                XmlSerializer xmlSer=new XmlSerializer(typeof(MyData));
                FileStream fo=new  FileStream(path,FileMode.Open);

                object data=xmlSer.Deserialize(fo);
                fo.Close();

                return data as MyData;
            }

            void XmlSerialize(string path)
            {
                XmlSerializer xmlSer=new XmlSerializer(this.GetType());
                FileStream fo=new  FileStream(path,FileMode.OpenOrCreate);

                xmlSer.Serialize(fo,this);
                fo.Close();
            }

            public enum SerializeTo{XML,Binary};

            public void Serialize(string path,SerializeTo to)
            {
                if(to==SerializeTo.Binary)
                    this.BinSerialize(path);
                else 
                    this.XmlSerialize(path);
            }

            public static MyData Load(string path,SerializeTo to)
            {
                if(to==SerializeTo.Binary)
                    return BinLoad(path);
                else 
                    return XmlLoad(path);
            }

        }
</code>

I'm not sure it works just after putting the types because I couldn't test that, but i'm sure it will give you the clue

another thing MyData Class can be serialize in both Xml and Binary

hope the post would be useful

good luck my friend

cyn820-Aug-07 0:53