Re: Significance of the Static and Virtual - C# Discussion Boards

Re: Syntax error (missing operator) in query expression

3-Dec-08 10:50

And as an addition to the previous post, use parameters for values. You are now for example vulnerable to sql injections.

The need to optimize rises from a bad design.My articles[^]

Christian Graus3-Dec-08 11:47

Re: Syntax error (missing operator) in query expression

3-Dec-08 11:47

1: instead of saying 'not working', tell us what the error is. Putting commas in to fix your SQL will obviously work.

2: read up on SQL Injection attacks, to find out how I can erase your entire database if you release this code

3: tell me you're not really using variables called textBox1, textBox2, etc. Or are you trying to write unreadable code on purpose ?

Christian Graus

Driven to the arms of OSX by Vista.

User 43300283-Dec-08 14:42

User 4330028

3-Dec-08 14:42

You may try this:

updatecom.CommandText = "update test2 set name='" + textBox1.Text + "', job= '" + textBox2.Text +"', title='" + textBox3.Text + "' where id='" + textBox4.Text + "'";

Fixed "," and "'"

Saludos!!

____Juan

Significance of the Static and Virtual

Pr@teek B@h!3-Dec-08 9:58

Pr@teek B@h!

3-Dec-08 9:58

Hi,
This might seem pretty basic but can anybody explain why and/or when a method should have the static or virtual? i.e.

public static void Method1()
{}

Thanks,

Prateek

Re: Significance of the Static and Virtual

Wendelius3-Dec-08 10:20

Re: Significance of the Static and Virtual

3-Dec-08 10:20

I think they are very well described in BOL with examples:
- static (C# Reference)[^]
- virtual (C# Reference)[^]

The need to optimize rises from a bad design.My articles[^]

Pr@teek B@h!4-Dec-08 3:34

Pr@teek B@h!

4-Dec-08 3:34

I guess i should have checked msdn first before posting the question. D'Oh! | :doh:

Thanks

Re: Significance of the Static and Virtual

Wendelius4-Dec-08 4:04

Calendar will not show highlighted day

4-Dec-08 4:04

You're welcome.

The need to optimize rises from a bad design.My articles[^]

Glacier63273-Dec-08 9:55

Glacier6327

3-Dec-08 9:55

I have a standard Calendar Control:

<asp:calendar id="calNewFirstDateAvailable" runat="server" tooltip="Select First Available Date" xmlns:asp="#unknown">
</asp:calendar>

And I am attempting to set a specific Date as the highlighted date programatically, but it is not highlighting the day in the control.

calUpdateFirstDateAvailable.SelectedDayStyle.BackColor = System.Drawing.Color.Black;
calUpdateFirstDateAvailable.SelectedDayStyle.ForeColor = System.Drawing.Color.White;
calUpdateFirstDateAvailable.SelectionMode = CalendarSelectionMode.Day;
calUpdateFirstDateAvailable.SelectedDate = atsi.StartDate;
calUpdateFirstDateAvailable.VisibleDate = atsi.StartDate;

atis.StartDate is a DateTime type with the value of '{11/12/2008 11:09:03 AM}'

What am I doing wrong?

Any Help would be greatly appreciated.

VS2008 .net 3.5

Thanks,

Robert

Re: Calendar will not show highlighted day

leppie3-Dec-08 10:24

leppie

3-Dec-08 10:24

This may be completely wrong, but I recall the order you set the properties may have an affect on what and when is displayed.

BTW: ASP.NET questions belong in the ASP.NET forum.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 beta 1 - out now!
((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))

Component To Select Multiple Folders

Michael Fritzius3-Dec-08 9:49

Michael Fritzius

3-Dec-08 9:49

Hello,

I can't seem to find any info regarding this because I don't know what to look for. I really have tried looking on the net, looking on here, searching both articles and message boards, and nothing is quite what I'm needing.

What I'm trying to do is find a component that shows the contents of my drive, similar to looking at the Desktop in the Explorer.

I would also like to have checkboxes next to the folder names so that a user can select multiple folders. Checkboxes are preferred, but if Ctrl+Select is the only option, then ok.

Something like this is out there... I know I've seen it somewhere, but just can't find out what it's called, or any code that uses it as an example.

Any suggestions?

Thanks,
Michael Fritzius

Christian Graus3-Dec-08 9:50

3-Dec-08 9:50

There's nothing that's standard, it would have to be a user control of some sort.

Christian Graus

Driven to the arms of OSX by Vista.

Michael Fritzius3-Dec-08 9:56

Michael Fritzius

3-Dec-08 9:56

That's fine--I'm not set on using anything standard anyway. But I wouldn't even know how to make my own control for this application. Has anyone made something like this?

Wendelius3-Dec-08 10:57

3-Dec-08 10:57

For the tree portion, have a look at: Tri-State TreeView Control[^] or Three State TreeView – Part 1 of 2[^]

The need to optimize rises from a bad design.My articles[^]

Michael Fritzius5-Dec-08 2:32

Michael Fritzius

5-Dec-08 2:32

Excellent. Looks like this would work. Thanks!

Wendelius5-Dec-08 8:19

How to convert dynamicaly an array of one type to an array of another type

5-Dec-08 8:19

You're welcome Smile | :)

The need to optimize rises from a bad design.My articles[^]

User 43300283-Dec-08 7:57

User 4330028

3-Dec-08 7:57

Hi, i want to convert arrys of one type to arrays of another type
Here is the code that i have

public object ConvertTo(Type myType, object value) {
     // code...
     // value is an array
     object[] ret = Array.ConvertAll(value as object[], delegate(object o) { return Convert.ChangeType(o, t.GetElementType()); });
     return ret;
}

Everithing its just fine, but the problem using Array.ConvertAll is that I have an object[] reference, an not an t.GetElementType()[] reference

So, when i use the variable returned by that function, i have an InvalidCastException because object[] cannot be converted to myType[]

How can i make a cast to the type i really want?

The next code works perfectly, but i want it to work with a generic type

public object ConvertToStringArray(object value) {
     // code...
     // value is an array of anything
     string[] ret = (string[])Array.ConvertAll(value as object[], delegate(object o) { return o.ToString(); });
     return ret;
}

Maybe the question is how to create an array of a type represented by an instance of System.Type
Example:

Type t = typeof(System.String);
// create an array of t? like string[] ?

Saludos!!

____Juan

Re: How to convert dynamicaly an array of one type to an array of another type

Christian Graus3-Dec-08 9:07

Re: How to convert dynamicaly an array of one type to an array of another type

3-Dec-08 9:07

Maybe you need to write a generic method that takes a type and creates an array of that type ?

Christian Graus

Driven to the arms of OSX by Vista.

User 66583-Dec-08 9:48

User 6658

3-Dec-08 9:48

Isn't that what Array.ConvertAll<TInput, TOutput>[^] is for?

regards

modified 12-Sep-18 21:01pm.

Re: How to convert dynamicaly an array of one type to an array of another type

Christian Graus3-Dec-08 9:50

Re: How to convert dynamicaly an array of one type to an array of another type

3-Dec-08 9:50

hmmm..... sounds good. Smile | :)

Christian Graus

Driven to the arms of OSX by Vista.

User 43300283-Dec-08 14:21

User 4330028

3-Dec-08 14:21

You are almost right

Array.ConvertAll will convert the array, and all the objects included in the array will have the right type (t.GetElementType() in my example)

The problem is, that Array.ConvertAll returns a reference who is an object[], and, when i use this object as a parameter to a method, that gives me an InvalidCastException because it cannot convert from object[] to myType[], i mean, if you want to convert to string[] you may just write

string[] test = (string[]) Array.ConvertAll....

But here the type is given dynamicaly

I fixed it using a not very good strategy, but it works, here is the code:

public object ConvertTo(Type t, object value) {
    if (t == null) {
        return value;
    }
    if (t.IsEnum) {
        return Enum.Parse(t, value.ToString());
    }
    if (t.IsArray) {
        object[] _valArr;
        if (value.GetType().IsArray)
            _valArr = value as object[];
        else
            _valArr = new object[] { value };

        Array ret = Array.CreateInstance(t.GetElementType(), _valArr.Length);
        Array.ConvertAll(_valArr, delegate(object o) { return Convert.ChangeType(o, t.GetElementType()); }).CopyTo(ret, 0);

        return ret;
    }
    return Convert.ChangeType(value, t);
}

Saludos!!

____Juan

PDF Viewer for Win Form App using C#

Karmendra Suthar3-Dec-08 7:47

Karmendra Suthar

3-Dec-08 7:47

Hi,

Is there any control available in Visual Studio 2008, which i can use to see pdf files in my Win Form Application, somewhat like RTF controls?

Thanks
Karmendra

Re: PDF Viewer for Win Form App using C#

Wendelius3-Dec-08 8:20