IsNullOrEmpty
How do I use Is Null Or Empty
Below are practical examples compiled from projects for learning and reference purposes
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File name: frmReg.cs
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30 private void txt6_Validating_1(object sender, CancelEventArgs e)
31 {
32 if (string.IsNullOrEmpty(txt6.Text))
33 {
34 errorProvider1.SetError(txt6, "Bạn phải nhập giá trị vào ô này");
35 e.Cancel = true;
36 }
37 else
38 {
39 errorProvider1.Clear();
40 }
41 }
File name: ChatGui.cs
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58 public void Start()
59 {
60 DontDestroyOnLoad(this.gameObject);
61 Application.runInBackground = true; // this must run in background or it will drop connection if not focussed.
62
63 if (string.IsNullOrEmpty(this.UserName))
64 {
65 this.UserName = "user" + Environment.TickCount%99; //made-up username
66 }
67
68 chatClient = new ChatClient(this);
69 chatClient.Connect(ChatAppId, "1.0", this.UserName, null);
70
71 if (this.AlignBottom)
72 {
73 this.GuiRect.y = Screen.height - this.GuiRect.height;
74 }
75 if (this.FullScreen)
76 {
77 this.GuiRect.x = 0;
78 this.GuiRect.y = 0;
79 this.GuiRect.width = Screen.width;
80 this.GuiRect.height = Screen.height;
81 }
82
83 Debug.Log(this.UserName);
84 }
File name: ChatGui.cs
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103 public void OnGUI()
104 {
105 if (!this.IsVisible)
106 {
107 return;
108 }
109
110 GUI.skin.label.wordWrap = true;
111 //GUI.skin.button.richText = true; // this allows toolbar buttons to have bold/colored text. nice to indicate new msgs
112 //GUILayout.Button("lala"); // as richText, html tags could be in text
113
114
115 if (Event.current.type == EventType.KeyDown && (Event.current.keyCode == KeyCode.KeypadEnter || Event.current.keyCode == KeyCode.Return))
116 {
117 if ("ChatInput".Equals(GUI.GetNameOfFocusedControl()))
118 {
119 // focus on input -> submit it
120 GuiSendsMsg();
121 return; // showing the now modified list would result in an error. to avoid this, we just skip this single frame
122 }
123 else
124 {
125 // assign focus to input
126 GUI.FocusControl("ChatInput");
127 }
128 }
129
130 GUI.SetNextControlName("");
131 GUILayout.BeginArea(this.GuiRect);
132
133 GUILayout.FlexibleSpace();
134
135 if (this.chatClient.State != ChatState.ConnectedToFrontEnd)
136 {
137 GUILayout.Label("Not in chat yet.");
138 }
139 else
140 {
141 List
142 int countOfPublicChannels = channels.Count;
143 channels.AddRange(this.chatClient.PrivateChannels.Keys);
144
145 if (channels.Count > 0)
146 {
147 int previouslySelectedChannelIndex = this.selectedChannelIndex;
148 int channelIndex = channels.IndexOf(this.selectedChannelName);
149 this.selectedChannelIndex = (channelIndex >= 0) ? channelIndex : 0;
150
151 this.selectedChannelIndex = GUILayout.Toolbar(this.selectedChannelIndex, channels.ToArray(), GUILayout.ExpandWidth(false));
152 this.scrollPos = GUILayout.BeginScrollView(this.scrollPos);
153
154 this.doingPrivateChat = (this.selectedChannelIndex >= countOfPublicChannels);
155 this.selectedChannelName = channels[this.selectedChannelIndex];
156
157 if (this.selectedChannelIndex != previouslySelectedChannelIndex)
158 {
159 // changed channel -> scroll down, if private: pre-fill "to" field with target user's name
160 this.scrollPos.y = float.MaxValue;
161 if (this.doingPrivateChat)
162 {
163 string[] pieces = this.selectedChannelName.Split(new char[] {':'}, 3);
164 this.userIdInput = pieces[1];
165 }
166 }
167
168 GUILayout.Label(ChatGui.WelcomeText);
169
170 if (this.chatClient.TryGetChannel(selectedChannelName, this.doingPrivateChat, out this.selectedChannel))
171 {
172 for (int i = 0; i < this.selectedChannel.Messages.Count; i++)
173 {
174 string sender = this.selectedChannel.Senders[i];
175 object message = this.selectedChannel.Messages[i];
176 GUILayout.Label(string.Format("{0}: {1}", sender, message));
177 }
178 }
179
180 GUILayout.EndScrollView();
181 }
182 }
183
184
185 GUILayout.BeginHorizontal();
186 if (doingPrivateChat)
187 {
188 GUILayout.Label("to:", GUILayout.ExpandWidth(false));
189 GUI.SetNextControlName("WhisperTo");
190 this.userIdInput = GUILayout.TextField(this.userIdInput, GUILayout.MinWidth(100), GUILayout.ExpandWidth(false));
191 string focussed = GUI.GetNameOfFocusedControl();
192 if (focussed.Equals("WhisperTo"))
193 {
194 if (this.userIdInput.Equals("username"))
195 {
196 this.userIdInput = "";
197 }
198 }
199 else if (string.IsNullOrEmpty(this.userIdInput))
200 {
201 this.userIdInput = "username";
202 }
203
204 }
205 GUI.SetNextControlName("ChatInput");
206 inputLine = GUILayout.TextField(inputLine);
207 if (GUILayout.Button("Send", GUILayout.ExpandWidth(false)))
208 {
209 GuiSendsMsg();
210 }
211 GUILayout.EndHorizontal();
212 GUILayout.EndArea();
213 }
File name: ChatGui.cs
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215 private void GuiSendsMsg()
216 {
217 if (string.IsNullOrEmpty(this.inputLine))
218 {
219
220 GUI.FocusControl("");
221 return;
222 }
223
224 if (this.inputLine[0].Equals('\\'))
225 {
226 string[] tokens = this.inputLine.Split(new char[] {' '}, 2);
227 if (tokens[0].Equals("\\help"))
228 {
229 this.PostHelpToCurrentChannel();
230 }
231 if (tokens[0].Equals("\\state"))
232 {
233 int newState = int.Parse(tokens[1]);
234 this.chatClient.SetOnlineStatus(newState, new string[] { "i am state " + newState }); // this is how you set your own state and (any) message
235 }
236 else if (tokens[0].Equals("\\subscribe") && !string.IsNullOrEmpty(tokens[1]))
237 {
238 this.chatClient.Subscribe(tokens[1].Split(new char[] {' ', ','}));
239 }
240 else if (tokens[0].Equals("\\unsubscribe") && !string.IsNullOrEmpty(tokens[1]))
241 {
242 this.chatClient.Unsubscribe(tokens[1].Split(new char[] {' ', ','}));
243 }
244 else if (tokens[0].Equals("\\clear"))
245 {
246 if (this.doingPrivateChat)
247 {
248 this.chatClient.PrivateChannels.Remove(this.selectedChannelName);
249 }
250 else
251 {
252 ChatChannel channel;
253 if (this.chatClient.TryGetChannel(this.selectedChannelName, this.doingPrivateChat, out channel))
254 {
255 channel.ClearMessages();
256 }
257 }
258 }
259 else if (tokens[0].Equals("\\msg") && !string.IsNullOrEmpty(tokens[1]))
260 {
261 string[] subtokens = tokens[1].Split(new char[] {' ', ','}, 2);
262 string targetUser = subtokens[0];
263 string message = subtokens[1];
264 this.chatClient.SendPrivateMessage(targetUser, message);
265 }
266 }
267 else
268 {
269 if (this.doingPrivateChat)
270 {
271 this.chatClient.SendPrivateMessage(this.userIdInput, this.inputLine);
272 }
273 else
274 {
275 this.chatClient.PublishMessage(this.selectedChannelName, this.inputLine);
276 }
277 }
278
279 this.inputLine = "";
280 GUI.FocusControl("");
281 }
File name: NamePickGui.cs
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15 public void Awake()
16 {
17 this.guiCenteredRect = new Rect(Screen.width/2-GuiSize.x/2, Screen.height/2-GuiSize.y/4, GuiSize.x, GuiSize.y);
18 this.chatComponent = this.GetComponent
19
20 if (this.chatComponent != null && chatComponent.enabled)
21 {
22 Debug.LogWarning("When using the NamePickGui, ChatGui should be disabled initially.");
23
24 if (this.chatComponent.chatClient != null)
25 {
26 this.chatComponent.chatClient.Disconnect();
27 }
28 this.chatComponent.enabled = false;
29 }
30
31 string prefsName = PlayerPrefs.GetString(NamePickGui.UserNamePlayerPref);
32 if (!string.IsNullOrEmpty(prefsName))
33 {
34 this.InputLine = prefsName;
35 }
36 }
File name: NamePickGui.cs
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38 public void OnGUI()
39 {
40 // Enter-Key handling:
41 if (Event.current.type == EventType.KeyDown && (Event.current.keyCode == KeyCode.KeypadEnter || Event.current.keyCode == KeyCode.Return))
42 {
43 if (!string.IsNullOrEmpty(this.InputLine))
44 {
45 this.StartChat();
46 return;
47 }
48 }
49
50
51 GUI.skin.label.wordWrap = true;
52 GUILayout.BeginArea(guiCenteredRect);
53
54
55 if (this.chatComponent != null && string.IsNullOrEmpty(this.chatComponent.ChatAppId))
56 {
57 GUILayout.Label("To continue, configure your Chat AppId.\nIt's listed in the Chat Dashboard (online).\nStop play-mode and edit:\nScripts/ChatGUI in the Hierarchy.");
58 if (GUILayout.Button("Open Chat Dashboard"))
59 {
60 Application.OpenURL("https://www.exitgames.com/en/Chat/Dashboard");
61 }
62 GUILayout.EndArea();
63 return;
64 }
65
66 GUILayout.Label(this.helpText);
67
68 GUILayout.BeginHorizontal();
69 GUI.SetNextControlName("NameInput");
70 this.InputLine = GUILayout.TextField(this.InputLine);
71 if (GUILayout.Button("Connect", GUILayout.ExpandWidth(false)))
72 {
73 this.StartChat();
74 }
75 GUILayout.EndHorizontal();
76
77 GUILayout.EndArea();
78
79
80 GUI.FocusControl("NameInput");
81 }
File name: OnClickCallMethod.cs
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11 public void OnClick()
12 {
13 if (this.TargetGameObject == null || string.IsNullOrEmpty(this.TargetMethod))
14 {
15 Debug.LogWarning(this + " can't call, cause GO or Method are empty.");
16 return;
17 }
18
19 this.TargetGameObject.SendMessage(this.TargetMethod);
20 }
File name: PunStartup.cs
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34 static void OnUpdate()
35 {
36 bool doneBefore = EditorPrefs.GetBool("PunDemosOpenedBefore");
37 if (doneBefore)
38 {
39 EditorApplication.update -= OnUpdate;
40 return;
41 }
42
43 if (String.IsNullOrEmpty(EditorApplication.currentScene) && EditorBuildSettings.scenes.Length == 0)
44 {
45 #if UNITY_4_2 || UNITY_4_3 || UNITY_4_4 || UNITY_4_5 || UNITY_4_6 || UNITY_5 || UNITY_5_1 || UNITY_5_2
46 if (EditorApplication.isUpdating) return;
47 #endif
48
49 LoadPunDemoHub();
50 SetPunDemoBuildSettings();
51 EditorPrefs.SetBool("PunDemosOpenedBefore", true);
52 Debug.Log("No scene was open. Loaded PUN Demo Hub Scene and added demos to build settings. Ready to go! This auto-setup is now disabled in this Editor.");
53 }
54 }
File name: HubGui.cs
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28 void OnGUI()
29 {
30 GUI.skin = this.Skin;
31 GUILayout.Space(10);
32
33 GUILayout.BeginHorizontal();
34 GUILayout.Space(10);
35 scrollPos = GUILayout.BeginScrollView(scrollPos, GUILayout.Width(320));
36
37 GUILayout.Label("Basics", m_Headline);
38 if (GUILayout.Button("Demo Boxes", GUILayout.Width(280)))
39 {
40 demoDescription = "
41 demoBtn = new DemoBtn() { Text = "Start", Link = "DemoBoxes-Scene" };
42 }
43 if (GUILayout.Button("Demo Worker", GUILayout.Width(280)))
44 {
45 demoDescription = "
46 demoBtn = new DemoBtn() { Text = "Start", Link = "DemoWorker-Scene" };
47 }
48 if (GUILayout.Button("Movement Smoothing", GUILayout.Width(280)))
49 {
50 demoDescription = "
51 demoBtn = new DemoBtn() { Text = "Start", Link = "DemoSynchronization-Scene" };
52 }
53
54 GUILayout.Label("Advanced", m_Headline);
55 if (GUILayout.Button("Ownership Transfer", GUILayout.Width(280)))
56 {
57 demoDescription = "
58 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoChangeOwner-Scene" };
59 this.webLink = new DemoBtn();
60 }
61 if (GUILayout.Button("Pickup, Teams, Scores", GUILayout.Width(280)))
62 {
63 demoDescription = "
64 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoPickup-Scene" };
65 this.webLink = new DemoBtn();
66 }
67
68 GUILayout.Label("Feature Demos", m_Headline);
69 if (GUILayout.Button("Chat", GUILayout.Width(280)))
70 {
71 demoDescription = "
72 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoChat-Scene" };
73 this.webLink = new DemoBtn();
74 }
75 if (GUILayout.Button("RPG Movement", GUILayout.Width(280)))
76 {
77 demoDescription = "
78 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoRPGMovement-Scene" };
79 this.webLink = new DemoBtn();
80 }
81 if (GUILayout.Button("Mecanim Animations", GUILayout.Width(280)))
82 {
83 demoDescription = "
84 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoMecanim-Scene" };
85 this.webLink = new DemoBtn();
86 }
87 if (GUILayout.Button("2D Game", GUILayout.Width(280)))
88 {
89 demoDescription = "
90 this.demoBtn = new DemoBtn() { Text = "Start", Link = "Demo2DJumpAndRunWithPhysics-Scene" };
91 this.webLink = new DemoBtn();
92 }
93 if (GUILayout.Button("Friends & Authentication", GUILayout.Width(280)))
94 {
95 demoDescription = "
96 this.demoBtn = new DemoBtn() { Text = "Start", Link = "DemoFriends-Scene" };
97 this.webLink = new DemoBtn();
98 }
99
100 GUILayout.Label("Tutorial", m_Headline);
101 if (GUILayout.Button("Marco Polo Tutorial", GUILayout.Width(280)))
102 {
103 demoDescription = "
104 this.demoBtn = new DemoBtn() { Text = "Start", Link = "MarcoPolo-Scene" };
105 this.webLink = new DemoBtn() { Text = "Open Tutorial (www)", Link = "http://tinyurl.com/nmylf44" };
106 }
107 GUILayout.EndScrollView();
108
109 GUILayout.BeginVertical(GUILayout.Width(Screen.width - 345));
110 GUILayout.Label(demoDescription);
111 GUILayout.Space(10);
112 if (!string.IsNullOrEmpty(this.demoBtn.Text))
113 {
114 if (GUILayout.Button(this.demoBtn.Text))
115 {
116 Application.LoadLevel(this.demoBtn.Link);
117 }
118 }
119 if (!string.IsNullOrEmpty(this.webLink.Text))
120 {
121 if (GUILayout.Button(this.webLink.Text))
122 {
123 Application.OpenURL(this.webLink.Link);
124 }
125 }
126 GUILayout.EndVertical();
127
128
129 GUILayout.EndHorizontal();
130 }
File name: WorkerMenu.cs
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28 {
29 get
30 {
31 return errorDialog;
32 }
33 private set
34 {
35 errorDialog = value;
36 if (!string.IsNullOrEmpty(value))
37 {
38 timeToClearDialog = Time.time + 4.0f;
39 }
40 }
41 }
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