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DataSet : Error when trying to use ReadXml the 2nd time

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LEBRUN Thomas

Hi,

On my application, i'm using this :

dataSet1.ReadXml(textBox1.Text, XmlReadMode.Auto);

This works fine the first time but the second time, if i changed the value
of textBox1.Text, dataSet1 is not reading the XML file which is in
textBox1.Text, but it's reading the XML file i've used the first time....

Do you know how to solve this ?

Thank You.

--
LEBRUN Thomas
http://morpheus.developpez.com

Reply to this message...

Cor Ligthert

Thomas,

Are you sure of that it is not reading however just throw an error because
you did not clear it in advance?

Just a thought?

Cor

[Original message clipped]

Reply to this message...

LEBRUN Thomas

Hi,

Thank for your response.
But i'm clearing the dataSet before reading the XML file so i don't know why
i get this....

Another ideas ?

Thanks.

"Cor Ligthert" wrote:

[Original message clipped]

Reply to this message...

Cor Ligthert

Thomas,

I made a sample tried it and had not any problem at all.

static void Main()
{
Application.Run(new Form1());
DataSet ds = new DataSet();
DataTable dt = new DataTable();
dt.Columns.Add("mycolumn",Type.GetType("System.DateTime"));
ds.Tables.Add(dt);
DateTime mydate;
mydate = DateTime.Now;
for (int i = 0; i <10 ;i++)
{
DataRow dr = dt.NewRow();
dr[0]= mydate.AddDays(i);
dt.Rows.Add(dr);
}
ds.WriteXml(@"C:\F1.xml");
ds = new DataSet();
dt = new DataTable();
dt.Columns.Add("mycolumn",Type.GetType("System.Int32"));
ds.Tables.Add(dt);
for (int i = 0; i <10 ;i++)
{
DataRow dr = dt.NewRow();
dr[0]= i.ToString();
dt.Rows.Add(dr);
}
ds.WriteXml(@"C:\F2.xml");
}
private void button3_Click(object sender, System.EventArgs e)
{
DataSet ds = new DataSet();
ds.ReadXml(this.textBox1.Text);
this.dataGrid1.DataSource = ds.Tables[0];
}
}

Reply to this message...

LEBRUN Thomas

Yes, i think you get no errors because you have define one dataset by
procedure/functions.

try this instead :
DataSet ds;

......

(in InitializeComponents, you have) :

this.ds = new DataSet();

And use :

private void button1_Click(object sender, System.EventArgs e)
{
ds.ReadXml(this.textBox1.Text);
this.dataGrid1.DataSource = ds.Tables[0];
}

The first time you click the button1, you have no problem.
The 2nd time, after you have changed the name of the file in textBox1.Text,
you will have the error i had.....

If you don't understand what i want to say, use this :

http://morpheus.developpez.com/temp/WindowsApplication6.zip

Thank.

"Cor Ligthert" wrote:

[Original message clipped]

Reply to this message...

Cor Ligthert

Thomas,

When I use this code without the ds.clear I have the same effect as you.

DataSet ds = new DataSet();
private void button3_Click(object sender, System.EventArgs e)
{
ds.Clear();
ds.ReadXml(this.textBox1.Text);
this.dataGrid1.DataSource = ds.Tables[0];
)

With the ds.Clear(); it shows when I change the textbox two different
datasets.

Instead of the ds.Clear() you can use of course as well
ds = new DataSet();

That was what I tried to show you.

I hope this helps?

Cor

Reply to this message...

LEBRUN Thomas

hum.. really strange....

It doesn't work for me with the ds.Clear()....

I will search for another way to do what i want.

Thank you again :)

Bye.

"Cor Ligthert" wrote:

[Original message clipped]

Reply to this message...

	System.Data.DataRow
	System.Data.DataSet
	System.Data.DataTable
	System.Data.XmlReadMode
	System.DateTime
	System.EventArgs
	System.Int32
	System.Type
	System.Windows.Forms.Application

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