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TextBox.Text += “string”; vs TextBox.AppendText(“string”);

2016-03-04 16:15 447 查看

转自：http://stackoverflow.com/questions/20632372/textbox-text-string-vs-textbox-appendtextstring

10down
voteaccepted

As it is clearly mentioned in Remarks
section of MSDN Documentation

The AppendText method enables the user to append text to the contents of a text control without using text concatenation, which, can yield better performance when many concatenations are required.

Your question,

what is the difference between these two methods?

We all know how

TextBox.Text
+= something;

will work i.e. creating and appending a new string each time but how

AppendText

works
I could not find any code snippet whether internally it uses

StringBuilder

or
something else.

Is one more efficient than the other?

I think answer to above question will depend on the situation, (Based on Test case observation)

if

Multiline

property
is set to

false

then Concatenation
(+=) yields better results but on other hand

Multiline

property
is set to

True

then

AppendText

yields
far better performance.

EDIT After reading the comment
from Rawling I made a custom win-form solution in which I had a simple

textbox

in
which I appended a simple string

hello

10000 times
using a simple

for-loop

private void btnAppendText_Click(object sender, EventArgs e)
{
txtText.Text = string.Empty;
DateTime startTime = DateTime.Now;
for (int i = 0; i < 10000; i++)
{
txtText.AppendText(s);
}
DateTime endTime = DateTime.Now;
txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString();
}

private void btnConcante_Click(object sender, EventArgs e)
{
txtText.Text = string.Empty;
DateTime startTime = DateTime.Now;
for (int i = 0; i < 5000; i++)
{
txtText.Text += s;
}
DateTime endTime = DateTime.Now;
txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString();
}

Output were very surprising,
TEST 1: Multiline property is true I had to reduce the iteration to half i.e. 5000 for text concatenation as it was talking very long time

btnAppendText_Click

output
on

txtTime

was

37222129

almost
3-4 seconds for 10000 iteration

btnConcante_Click

output
on

txtTime

was

14449906487

more
then 25 minutes for only 5000 iteration

From the above result it is really clear that,

AppendText

is
much faster and efficient (when

Multiline

True

)
then

Concatenation

TEST 2: Multiline property is false

btnConcante_Click

output
on

txtTime

was

39862280

almost
3-4 seconds for 10000 iteration

btnAppendText_Click

output
on

txtTime

was

1043279672

almost
2-3 minutes for 10000 iteration

From the above result it is really clear that, Concatenation is faster and efficient (when

Multiline

false

)
then

AppendText

10down
voteaccepted

TextBox.Text
+= something;

will work i.e. creating and appending a new string each time but how

AppendText

works
I could not find any code snippet whether internally it uses

StringBuilder

or
something else.

Is one more efficient than the other?

I think answer to above question will depend on the situation, (Based on Test case observation)

if

Multiline

property
is set to

false

then Concatenation
(+=) yields better results but on other hand

Multiline

property
is set to

True

then

AppendText

yields
far better performance.

EDIT After reading the comment
from Rawling I made a custom win-form solution in which I had a simple

textbox

in
which I appended a simple string

hello

10000 times
using a simple

for-loop

private void btnAppendText_Click(object sender, EventArgs e)
{
txtText.Text = string.Empty;
DateTime startTime = DateTime.Now;
for (int i = 0; i < 10000; i++)
{
txtText.AppendText(s);
}
DateTime endTime = DateTime.Now;
txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString();
}

private void btnConcante_Click(object sender, EventArgs e)
{
txtText.Text = string.Empty;
DateTime startTime = DateTime.Now;
for (int i = 0; i < 5000; i++)
{
txtText.Text += s;
}
DateTime endTime = DateTime.Now;
txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString();
}

Output were very surprising,
TEST 1: Multiline property is true I had to reduce the iteration to half i.e. 5000 for text concatenation as it was talking very long time

btnAppendText_Click

output
on

txtTime

was

37222129

almost
3-4 seconds for 10000 iteration

btnConcante_Click

output
on

txtTime

was

14449906487

more
then 25 minutes for only 5000 iteration

From the above result it is really clear that,

AppendText

is
much faster and efficient (when

Multiline

True

)
then

Concatenation

TEST 2: Multiline property is false

btnConcante_Click

output
on

txtTime

was

39862280

almost
3-4 seconds for 10000 iteration

btnAppendText_Click

output
on

txtTime

was

1043279672

almost
2-3 minutes for 10000 iteration

From the above result it is really clear that, Concatenation is faster and efficient (when

Multiline

false

)
then

AppendText

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