How do I delete or clear a string? Preferable delete...
So far I've tried:
myString.TrimEnd(0, myString.Length);
myString.Remove(0, myString.Length);
myString = null;
None of the above work...
Also- how do i clear a stringbuilder? Is it in the same way?
I'm using c# and working in Visual Web Developer.
I want to create new string or stringbuilder based on condition; Example . I am updating a count variable "i"; if i = 100, i need to create a string or stringbuilder; if else i = 200 i need to create a new string or stringbuilder; if else i = 300 i need to create a new string or stringbuilder; and so on how i can achive this?
View 8 RepliesString is immutable and StringBuilder is mutable. So if I change the value of a string a new memory created with the new value, whereas in StringBuilder it updates its memory location rather than creating a new memory location. So for large concatenation stringBuilders are preffered. But when I create a new String object, a fixed memory is created. And any changes will update its memory location, rather than creating a new memory location.
For e.g.
String s = new String();
s = String.Empty;
for ( int i=0;i<100; i++)
{
//s = s + "test" + i.ToString();
s =string.Concat(s, "test" + i.ToString()); ///This is effecient compared to previous step
}
Now instead of String class I will use a StringBuilder class.
StringBuilder s = new StringBuilder(String.Empty);
for ( int i=0;i<100; i++)
{
//s = s + "test" + i.ToString();
s.append( "test" + i.ToString());
}
I have create user wizard control and i put validation control for all field but when i close user control that validators dint clear in firefox or but clear in IE
View 3 RepliesWhat is difference between Session.Clear() vs. Session.Contents.Clear()?
I want to clear all the Session variables.
Is StringBuilder a datatype?
View 9 RepliesI've a string builder, and I need to convert it to a string, and then trim any commas if there are any there (I need to get rid of them because I'm building an sql query).
Here's what I'm doing:
myStringBuilder.ToString().TrimEnd(',');
Why isn't this working??? It's not trimming any commas at the end!
I'm using c# :)
I have a message on one and I'm sending that message to another using a Session. The problem is the message come out on one line, please code
[Code]....
Output: --- Original Message ---message for the user.
Output should be:
Original Message
message from the user. How do get the info on two lines?
I have a loop where i create some string value based on certain conditions. I did place StringBuilder object outside of the loop and each time i have new row in loop i need to clear StringBuilder appended values for this row.
How do i clear those?
[Code]....
How to display an image using the stringbuilder in C#.net
View 6 RepliesStringBuilder.Append using float is truncating the value. What is it converting to and how can I stop it from truncating?AttributeOrder is type float and I am losing precision when building the string.
if ( AttributeOrder != 0 )
{
if ( Result.Length > 0 )
[code]...
I'm building a product catalog which displays between 50/100 products per page.Since I want to have different browse sections on my site I've put each product into a UserControl. Well, not the products themselves ofcourse, but some labels, divs and images. I then set its properties in run-time when processing the database results. So the advantage is that I only have to change the product control at 1 place for the whole site. I'm putting the controls in a page using LoadControl in a loop.
However the pages are not loading quite as fast as other pages which process the same db query and output the same html using a StringBuilder. And since I want my site to perform well if/when it receives some decent traffic I'm worried about this. I haven't done any benchmarkings yet but I clearly see the difference. My questions to you is 'Are there any alternatives which are faster then using LoadControl with a customcontrol but are easily maintained (or atleast in 1 location)?'I was thinking of:
Creating a customcontrol (although I've never done it and don't know 100% if this will speed things up)Continue with the StringBuilder method and put the CreateProduct in my base class
[edit]Code[/edit]
I don't have the excact usercontrol code here but I will edit this post when I get home..but here is the simplified idea:
1) Getting my database result (using Subsonic 2.2 as my DAL)
DAL.ProductCollection coll = new DAL.ProductCollection();
if(coll.count > 0)
{
foreach(DAL.Product item in coll)[code]....
My usercontrol itselves just consists of 3 Literal controls and 1 Image control.
Actually I am wishing to use StringBuilder to Append DataTable as given below:
[Code]....
correct the line sb.Append(dt.Rows[i].Item(k, DataRowVersion.Current).toString()); to eliminate the following error:
'System.Data.DataRow' does not contain a definition for 'Item' and no extension method 'Item' accepting a first argument of the type 'System.Data.DataRow' could be found (are you missing a using directive of an assembly reference?).
Im developing a web application in asp.net where i have gridview with some text box controls in it.In runtime we are creating a new row dynamically by clicking add button .To insert data into the database.i used a stringbuilder instead of string becoz the data what i have to insert into database is more.but i am gettin the following error No mapping exists from object type System.Text.StringBuilder to a known managed provider native type. in database the datafield column datatype is varchar(max).
View 3 Replies[Code]....
basically the name of my package is pkg_test and it is in the finance schema and the name of the function in the package is called get_nameHowever everything I run that function, it is gives me an error.
i have a stringbuilder which loops thru the items details of my shopping cart like below:
StringBuilder sbo = new StringBuilder();
for (int i = 0; i != Cart.Order.Items.Length; ++i)
{
sbo.AppendLine(
string.Format(
"{0} {1} {2} {3} <br />",
Cart.Order.Items[i].ItemNumber,
Cart.Order.Items[i].ProductTitle,
Cart.Order.Items[i].Size,
Cart.Order.Items[i].Price.ToString("c")
)
);
}
now i would like to bind these details to 4 labels like lbItemno, lbProdTitle, lbSize, lbPrice.
i have been trying to create controls dynamically on my web page using the StringBuilder class..and i dont quite seem to get through...
i am trying to do this...
StringBuilder sbTest = new StringBuilder(string.Empty);
sbTest.Append("<input type="text" id="txt1" runat="server" />");
Response.Write(sbTest.ToString());
The page for sure displays a TextBox on the browser which is easily accessible through JavaScript...but what i want is the control to be available on the Server Side too...so that when the page is posted back to the server i can easliy obtain the value that has been entered by the user into the textbox.
I am converting HTML to Pdf using StringBuilder .. added one image using
Doc theDoc = new Doc();
System.Text.StringBuilder sbHtml = new System.Text.StringBuilder();
sbHtml.Append("<html>");
sbHtml.Append("<body>");
sbHtml.Append("</table></td> <td width='406' height='104'><div align='right'><img src='~/images/logo.jpg'
[Code] ....
Here image is not displaying in PDF ....
if i change the code and put checkbox between the <td> tag. when i click the save button, how can i check the ticked checkbox and get the value of the CHECKBOX_1 in cs?
[Code]....
I have been led to believe that the performance benefits of using StringBuilder over normal concatenation means that you should always use stringbuilder when concatenating more than 2 strings. However when I test them this does not seem to be the case. Take these 2 methods
public void TestMethod5()
{
for (int i = 0; i < 1000; i++)
{
string t = string.Empty;
t = "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd" + "dddddddd"; ;
}
}
public void TestMethod6()
{
for (int i = 0; i < 1000; i++)
{
StringBuilder sb = new StringBuilder();
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
sb.Append("dddddddd");
string t = string.Empty;
t = sb.ToString();
}
}
TestMethod5 takes 0.03 milliseconds so complete but TestMethod6 takes 1.43 milliseconds What is going on?
when we store more than one string in arraystring or in stringbuilder class objects.then how can we print it on alert box in asp.net
View 1 Repliesin my webapp I've created and populated a stringbuilder for a csv file. Normally I write it directly to the response object for the user to download through the browser.However, now I want to save it to a SQL DB image field. Is there a direct way to stream it in? Or do I have to save it to file first, then read it back in?
View 3 Replieshow can i do the split function like excel in stringBuilder?
View 4 Repliesi can get the checkbox value from the stringBuilder by request.form["field_id"].toString(), but how can i make the checkbox checked property to checked using C#.
[Code]....
I'm interested to hear from other developers their opinion on an approach that I typically take. I have a web application, asp.net 2.0, c#.
What I usually do to write out drop downs, tables, input controls, etc. is in the code behind use StringBuilder and write out something like sb.Append("
I don't find myself using to many .net controls as I typically write out the html in the code behind. When I want to use jQuery or call JavaScript I just put that function call in my sb.Append tag like sb.Append("td...onblur='fnCallJS()'.
I've gotten pretty comfortable with this approach. For data access I use EntitySpaces.
I'm just kind of curious if this sort of approach is horribly wrong, ok depending on the context, good, time to learn 3.0, etc. I'm interested in learning and was just looking for some input.
Edit
After reading the comments here it sounds like I should take a look at MVC. I've not done that yet. The only hesitancy in doing so is that the existing project is just that, existing. There is a lot of code already done the way I explained and it is hard to imagine what would be involved in changing it, advantages of doing so, and just learning what that would take.
The other thing I'm taking away from the comments is that my code behind should really not include much of the sb.Append code, whereas now it is filled with it in numerous functions. To me it is not messy but that is because I know what each function does and can look at it and see, oh that writes out x, y, and z.
It's not uncommon for me to just have a div on the .aspx part and then build up the .innerHtml of that with the StringBuilder in the code behind.