C # adding a line to another line

Question

Possible duplicate:
What is the best string concatenation method using C #?

I have a variable:

string variable1; 

And I'm trying to do something like this:

 for (int i = 0; i < 299; i += 2) { variable1 = variable1 && IntToHex(buffer[i]); } 

IntToHex is a string function, so the result of "IntToHex (buffer [i])" will be a string. But an error occurs: I cannot use & &. Is there a solution to add a line to another line? Thanks!

Answer 1

Just use the + operator:

 variable1 = variable1 + IntToHex(buffer[i]); 

You also need to initialize variable1 :

 string variable1 = string.Empty; 

or

 string variable1 = null; 

However, use StringBuilder , as this is more efficient:

 StringBuilder builtString = new StringBuilder(); for (int i = 0; i < 299; i += 2) { builtString.Append(IntToHex(buffer[i])); } string variable1 = builtString.ToString(); 

Answer 2

In C #, just use + to concatenate strings:

  variable1 = variable1 + IntToHex(buffer[i]); 

But more importantly, this situation requires StringBuilder.

  var buffer = new StringBuilder(); for (int i = 0; i < 299; i += 2) { buffer.Append( IntToHex(buffer[i]) ); } string variable1 = buffer.ToString(); 

For loops of 100 or more, this really greatly affects performance.

Answer 3

 variable1 = variable1 + IntToHex(buffer[i]); 

However, this is probably better:

 var sb = new StringBuilder(); for (int i = 0; i < 299; i += 2) { sb.Append(IntToHex(buffer[i])); } variable1 = sb.ToString(); 

Answer 4

&& is a conditional AND operator.

You can use the + operator to concatenate strings, but it is not recommended to use this in a loop (more) .

Use either StringBuilder :

 StringBuilder builder = new StringBuilder(299 * 4); // Or whatever for (int i = 0; i < 299; i += 2) { builder.Append(IntToHex(buffer[i])); } string combined = builder.ToString(); 

Or potentially use string.Join - it may not be so practical in this case, considering your loop, but in other cases it would be great. You can still use it here, for example:

 string combined = string.Join("", Enumerable.Range(0, 149) .Select(i => IntToHex(buffer[i * 2]))); 

Answer 5

 variable1 += IntToHex(buffer[i]); 

Answer 6

There are various ways to add a string to a string. you can use a simple + function, which is not recommended in most cases. string.concat and string.format are the preferred ways to add strings. also the stringBuilder class is useful when adding large parts of strings together

Answer 7

You need to use + to concatenate strings in C #

 for (int i = 0; i < 299; i += 2) { variable1 = variable1 + IntToHex(buffer[i]); } 

But StringBuilder would be a good option here ...

 StringBuilder sb = new StringBuilder(""); for (int i = 0; i < 299; i += 2) { sb= sb.Append(IntToHex(buffer[i])); }