![General Best Practices
Looping optimization
ArrayList list = new ArrayList();ArrayList list = new ArrayList();
for(int ifor(int i == 0; i0; i << list.Count; i++)list.Count; i++)
{{
MyObject o = (MyObject)list[i];MyObject o = (MyObject)list[i];
o.DoSomeWork();o.DoSomeWork();
}}
ArrayList list = new ArrayList();ArrayList list = new ArrayList();
MyObject oMyObject o = null;= null;
for(int ifor(int i == 00, n =, n = list.Count; ilist.Count; i << nn; i++); i++)
{{
o = (MyObject)list[i];o = (MyObject)list[i];
o.DoSomeWork();o.DoSomeWork();
}}](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-3-320.jpg)
![General Best Practices
Use proper casting, avoid polymorphic call
String s = “Hello world”;String s = “Hello world”;
Session[“key”] = s;Session[“key”] = s;
……
String result = Session[“key”].ToString();String result = Session[“key”].ToString();
String s = “Hello world”;String s = “Hello world”;
Session[“key”] = s;Session[“key”] = s;
……
String result =String result = (string)(string)Session[“key”];Session[“key”];](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-4-320.jpg)
![General Best Practices
static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) {
Stream input = File.OpenRead(sourceName);Stream input = File.OpenRead(sourceName);
Stream output = File.Create(destName);Stream output = File.Create(destName);
byte[] b = new byte[65536];byte[] b = new byte[65536];
int n;int n;
while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) {
output.Write(b, 0, n);output.Write(b, 0, n);
}}
output.Close();output.Close();
input.Close();input.Close();
}}
static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) {
Stream input = File.OpenRead(sourceName);Stream input = File.OpenRead(sourceName);
try {try {
Stream output = File.Create(destName);Stream output = File.Create(destName);
try {try {
byte[] b = new byte[65536];byte[] b = new byte[65536];
int n;int n;
while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) {
output.Write(b, 0, n);output.Write(b, 0, n);
}}
}}
finally {finally {
output.Close();output.Close();
}}
}}
finally {finally {
input.Close();input.Close();
}}
}}
static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) {
using (Stream input = File.OpenRead(sourceName))using (Stream input = File.OpenRead(sourceName))
using (Stream output = File.Create(destName)) {using (Stream output = File.Create(destName)) {
byte[] b = new byte[65536];byte[] b = new byte[65536];
int n;int n;
while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) {
output.Write(b, 0, n);output.Write(b, 0, n);
}}
}}
}}](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-6-320.jpg)
![ In time critical application, avoid using
‘foreach’
General Best Practices
public static void Main(string[] args) {public static void Main(string[] args) {
foreach (string s in args) Console.WriteLine(s);foreach (string s in args) Console.WriteLine(s);
}}
public static void Main(string[] args) {public static void Main(string[] args) {
for(int i = 0, n = args.Length; i < n; i++)for(int i = 0, n = args.Length; i < n; i++)
Console.WriteLine(args[i]);Console.WriteLine(args[i]);
}}](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-7-320.jpg)
![ASP .NET Specific
Be sure to disable debug mode
Avoid using DataBinder.Eval
<%# DataBinder.Eval(Container.DataItem, “myfield") %><%# DataBinder.Eval(Container.DataItem, “myfield") %>
<%#<%# ((DataRowView)Container.DataItem)[“myfield”].ToString()((DataRowView)Container.DataItem)[“myfield”].ToString() %>%>
<compilation defaultLanguage="c#"<compilation defaultLanguage="c#" debug=“debug=“falsefalse"" />/>](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-13-320.jpg)
![Windows Forms Specific
if(this.InvokeRequired)if(this.InvokeRequired)
{{
this.Invoke(this.Invoke(
newnew EventHandler(this.DisableButton),EventHandler(this.DisableButton),
new object[] {new object[] { null, EventArgs.Emptynull, EventArgs.Empty }}
););
}}](https://image.slidesharecdn.com/nkpwm0fptecjubtdxlhe-signature-367bb0cfc140d70c775569deaf5b3acc444ad733a724b64e9549275edaab08cc-poli-180225154851/85/Tips-and-Tricks-of-Developing-NET-Application-17-320.jpg)
Tips and Tricks of Developing .NET Application
- 1. Tips and Tricks of Developing .NET Application Joni Applied Technology Laboratories Bina Nusantara University
- 2. Agenda General Best Practices ASP .NET Specific Windows Forms Specific Resources
- 3. General Best Practices Looping optimization ArrayList list = new ArrayList();ArrayList list = new ArrayList(); for(int ifor(int i == 0; i0; i << list.Count; i++)list.Count; i++) {{ MyObject o = (MyObject)list[i];MyObject o = (MyObject)list[i]; o.DoSomeWork();o.DoSomeWork(); }} ArrayList list = new ArrayList();ArrayList list = new ArrayList(); MyObject oMyObject o = null;= null; for(int ifor(int i == 00, n =, n = list.Count; ilist.Count; i << nn; i++); i++) {{ o = (MyObject)list[i];o = (MyObject)list[i]; o.DoSomeWork();o.DoSomeWork(); }}
- 4. General Best Practices Use proper casting, avoid polymorphic call String s = “Hello world”;String s = “Hello world”; Session[“key”] = s;Session[“key”] = s; …… String result = Session[“key”].ToString();String result = Session[“key”].ToString(); String s = “Hello world”;String s = “Hello world”; Session[“key”] = s;Session[“key”] = s; …… String result =String result = (string)(string)Session[“key”];Session[“key”];
- 5. General Best Practices Acquire, Execute, Release pattern Works with any IDisposable object Data access classes, streams, text readers and writers, network classes, etc. using (Resource res = new Resource()) {using (Resource res = new Resource()) { res.DoWork();res.DoWork(); }} Resource res = new Resource(...);Resource res = new Resource(...); try {try { res.DoWork();res.DoWork(); }} finally {finally { if (res != null) ((IDisposable)res).Dispose();if (res != null) ((IDisposable)res).Dispose(); }}
- 6. General Best Practices static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) { Stream input = File.OpenRead(sourceName);Stream input = File.OpenRead(sourceName); Stream output = File.Create(destName);Stream output = File.Create(destName); byte[] b = new byte[65536];byte[] b = new byte[65536]; int n;int n; while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) { output.Write(b, 0, n);output.Write(b, 0, n); }} output.Close();output.Close(); input.Close();input.Close(); }} static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) { Stream input = File.OpenRead(sourceName);Stream input = File.OpenRead(sourceName); try {try { Stream output = File.Create(destName);Stream output = File.Create(destName); try {try { byte[] b = new byte[65536];byte[] b = new byte[65536]; int n;int n; while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) { output.Write(b, 0, n);output.Write(b, 0, n); }} }} finally {finally { output.Close();output.Close(); }} }} finally {finally { input.Close();input.Close(); }} }} static void Copy(string sourceName, string destName) {static void Copy(string sourceName, string destName) { using (Stream input = File.OpenRead(sourceName))using (Stream input = File.OpenRead(sourceName)) using (Stream output = File.Create(destName)) {using (Stream output = File.Create(destName)) { byte[] b = new byte[65536];byte[] b = new byte[65536]; int n;int n; while ((n = input.Read(b, 0, b.Length)) != 0) {while ((n = input.Read(b, 0, b.Length)) != 0) { output.Write(b, 0, n);output.Write(b, 0, n); }} }} }}
- 7. In time critical application, avoid using ‘foreach’ General Best Practices public static void Main(string[] args) {public static void Main(string[] args) { foreach (string s in args) Console.WriteLine(s);foreach (string s in args) Console.WriteLine(s); }} public static void Main(string[] args) {public static void Main(string[] args) { for(int i = 0, n = args.Length; i < n; i++)for(int i = 0, n = args.Length; i < n; i++) Console.WriteLine(args[i]);Console.WriteLine(args[i]); }}
- 8. General Best Practices public ArrayList GetList()public ArrayList GetList() {{ ArrayList temp = new ArrayList();ArrayList temp = new ArrayList(); …… return temp;return temp; }} …… public void DoWpublic void DoWoork()rk() {{ ArrayList list = new ArrayList();ArrayList list = new ArrayList(); list = GetList();list = GetList(); }} Avoid unnecessary object instantiation public ArrayList GetList()public ArrayList GetList() {{ ArrayList temp = new ArrayList();ArrayList temp = new ArrayList(); …… return temp;return temp; }} …… public void DoWork()public void DoWork() {{ ArrayList list =ArrayList list = nullnull;; list = GetList();list = GetList(); }} public ArrayList GetList()public ArrayList GetList() {{ ArrayList temp = new ArrayList();ArrayList temp = new ArrayList(); …… return temp;return temp; }} …… public void DoWork()public void DoWork() {{ ArrayList list =ArrayList list = GetList()GetList();; }}
- 9. General Best Practices Use StringBuilder for string manipulation publicpublic stringstring ProcessLongText()ProcessLongText() {{ string text = “How are you?”;string text = “How are you?”; string s = text;string s = text; for(int i = 0; i < 1000; i++)for(int i = 0; i < 1000; i++) {{ s += text;s += text; }} return s;return s; }} public string ProcessLongText()public string ProcessLongText() {{ string text = “How are you?”;string text = “How are you?”; StringBuilder s = new StringBuilder(text);StringBuilder s = new StringBuilder(text); for(int i = 0; i < 1000; i++)for(int i = 0; i < 1000; i++) {{ s.Append(text);s.Append(text); }} return s.ToString();return s.ToString(); }}
- 10. General Best Practices Do not rely on exceptions in your code try {try { result = 100 / num;result = 100 / num; }} catch (Exception e) {catch (Exception e) { result = 0;result = 0; }} if (num != 0)if (num != 0) result = 100 / num;result = 100 / num; elseelse result = 0;result = 0;
- 11. General Best Practices Don’t reinvent the wheel, unless you are super programmer, use existing class library Use Data Access Application Block for accessing database objectobject resultresult == SqlHelper.ExecuteScalar(connectionString,SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, sqlParameters);CommandType.StoredProcedure, spName, sqlParameters);
- 12. ASP .NET Specific Disable ViewState if not used Use output cache to speed-up performance Disable SessionState if not used Avoid unnecessary round trips to the server Use Page.IsPostBack to avoid performing unnecessary processing on a round trip Consider disabling AutoEventWireup for your application <%@ OutputCache Duration=“60" VaryByParam="None" Shared="true" %><%@ OutputCache Duration=“60" VaryByParam="None" Shared="true" %> <page enableSessionState="true|false|ReadOnly” /><page enableSessionState="true|false|ReadOnly” />
- 13. ASP .NET Specific Be sure to disable debug mode Avoid using DataBinder.Eval <%# DataBinder.Eval(Container.DataItem, “myfield") %><%# DataBinder.Eval(Container.DataItem, “myfield") %> <%#<%# ((DataRowView)Container.DataItem)[“myfield”].ToString()((DataRowView)Container.DataItem)[“myfield”].ToString() %>%> <compilation defaultLanguage="c#"<compilation defaultLanguage="c#" debug=“debug=“falsefalse"" />/>
- 14. ASP .NET Specific Override method, instead of attaching delegate to it private void InitializeComponent()private void InitializeComponent() {{ this.Load += new System.EventHandler(this.Page_Load);this.Load += new System.EventHandler(this.Page_Load); }} private void Page_Load(object sender, System.EventArgs e)private void Page_Load(object sender, System.EventArgs e) {{ …… }} protectedprotected overrideoverride voidvoid OnOnLoad(System.EventArgs e)Load(System.EventArgs e) {{ …… }}
- 15. ASP .NET Specific Use IDataReader instead of DataSet Use Repeater instead of DataGrid (if possible) Use the HttpServerUtility.Transfer method to redirect between pages in the same application Use early binding in Visual Basic .NET or JScript code <%@ Page Language="VB" Strict="true" %><%@ Page Language="VB" Strict="true" %>
- 16. Windows Forms Specific Use multithreading appropriately to make your application more responsive Windows Forms uses the single-threaded apartment (STA) model because Windows Forms is based on native Win32 windows that are inherently apartment- threaded. The STA model requires that any methods on a control that need to be called from outside the control's creation thread must be marshaled to (executed on) the control's creation thread
- 17. Windows Forms Specific if(this.InvokeRequired)if(this.InvokeRequired) {{ this.Invoke(this.Invoke( newnew EventHandler(this.DisableButton),EventHandler(this.DisableButton), new object[] {new object[] { null, EventArgs.Emptynull, EventArgs.Empty }} );); }}