Simple upload progress display through WCF File Upload

In many cases, uploading files is often used. Generally, I use two methods, one is through ashx extension, and the other is through WCF, this article only describes how to use the latter.

Practical functions: File Upload, simple upload progress display.

1. Create a new item in the Asp.net project: Silverlight-enabled WCF Service

Add a doupload method:

1. 1: [servicecontract (namespace = "")]
2. 2: [aspnetcompatibilityrequirements (requirementsmode = aspnetcompatibilityrequirementsmode. Allowed)]
3. 3: Public class service1
4. 4 :{
5. 5: [operationcontract]
6. 6: Public void doupload (string filename, byte [] context, bool append)
7. 7 :{
8. 8: // upload directory
9. 9: String folder = system. Web. Hosting. hostingenvironment. mappath ("~ /Upload ");
10. 10: If (! System. Io. Directory. exists (folder ))
11. 11 :{
12. 12: // If the upload directory does not exist, create
13. 13: system. Io. Directory. createdirectory (folder );
14. 14 :}
15. 15: // file read/write mode
16. 16: filemode M = filemode. Create;
17. 17: If (append)
18. 18 :{
19. 19: // If the parameter is true, the object is resumed and operated in append mode.
20. 20: M = filemode. append;
21. 21 :}
22. 22:
23. 23: // file write operation
24. 24: Using (filestream FS = new filestream (Folder + @ "\" + filename, M, fileaccess. Write ))
25. 25 :{
26. 26: fs. Write (context, 0, context. Length );
27. 27 :}
28. 28: return;
29. 29 :}
30. 30 :}

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2. reference the previously completed WCF Service. Right-click the Silverlight project and choose "add service reference ".

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Click the Discover button on the right.

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Click "OK". Note: if an error occurs, press F5 to run the entire project.

3. After successful reference, the implementation code in Sl is introduced. For simplicity, I only use one button control:

Mainpage. XAML

1. 1: <usercontrol X: class = "uploadfile. mainpage"
2. 2: xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3. 3: xmlns: x = "http://schemas.microsoft.com/winfx/2006/xaml"
4. 4: xmlns: D = "http://schemas.microsoft.com/expression/blend/2008" xmlns: MC = "http://schemas.openxmlformats.org/markup-compatibility/2006"
5. 5: MC: ignorable = "D" D: designwidth = "640" D: designheight = "480">
6. 6: <grid X: Name = "layoutroot">
7. 7: <button X: Name = "BT" content = "Upload" Height = "100" width = "200"/>
8. 8: </GRID>
9. 9: </usercontrol>

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4. mainpage. XAML. CS, all client operations

1. 1: Public partial class mainpage: usercontrol
2. 2 :{
3. 3: Public mainpage ()
4. 4 :{
5. 5: initializecomponent ();
6. 6 :}
7. 7:
8. 8: Public mainpage ()
9. 9 :{
10. 10: initializecomponent ();
11. 11: // register the button click event
12. 12: Bt. Click + = new routedeventhandler (bt_click );
13. 13 :}
14. 14:
15. 15: // Click Event
16. 16: void bt_click (Object sender, routedeventargs E)
17. 17 :{
18. 18: // select local file dialog box
19. 19: openfiledialog d = new openfiledialog ();
20. 20: // file filtering
21. 21: D. Filter = "(*. *) | *.*";
22. 22: // You can select only one file.
23. 23: D. multiselect = false;
24. 24: // The selection is complete.
25. 25: If (D. showdialog () = true)
26. 26 :{
27. 27: // delete file email
28. 28: fileinfo F = D. file;
29. 29: // new instantiate a file from the uploadfile class
30. 30: uploadfile file = new uploadfile ();
31. 31: // file name
32. 32: file. Name = f. Name;
33. 33: // file stream content
34. 34: stream S = f. openread ();
35. 35: // file size (/1000 is used for convenient viewing and becomes k as the Unit)
36. 36: file. size = S. Length/1000;
37. 37: // instance file content
38. 38: file. Context = new list <byte []> ();
39. 39:
40. 40: // read the content of the specified file stream to file. context to be uploaded.
41. 41: int B;
42. 42: While (S. Position>-1 & S. Position <S. length)
43. 43 :{
44. 44: If (S. Length-S. Position >=300)
45. 45 :{
46. 46: B = 3000;
47. 47 :}
48. 48: else
49. 49 :{
50. 50: B = (INT) (S. Length-S. position );
51. 51 :}
52. 52:
53. 53: byte [] filebyte = new byte [B];
54. 54: S. Read (filebyte, 0, B );
55. 55: file. Context. Add (filebyte );
56. 56 :}
57. 57: S. Close ();
58. 58:
59. 59: // instantiate the WCF Client
60. 60: servicereference1.uploadserviceclient Uploader = new uploadfile. servicereference1.uploadserviceclient ();
61. 61: // register the doupload completion event
62. 62: uploader. douploadcompleted + = new eventhandler <system. componentmodel. asynccompletedeventargs> (uploader_douploadcompleted );
63. 63: // start uploading the first package
64. 64: uploader. douploadasync (file. Name, file. Context [0], false, file );
65. 65 :}
66. 66 :}
67. 67:
68. 68: void uploader_douploadcompleted (Object sender, system. componentmodel. asynccompletedeventargs E)
69. 69 :{
70. 70: If (E. Error = NULL)
71. 71 :{
72. 72: // The previous package is successfully uploaded.
73. 73: uploadfile file = E. userstate as uploadfile;
74. 74: // modify the uploaded size (display function)
75. 75: file. Sent + = file. Context [0]. Length/1000;
76. 76: // Delete uploaded content
77. 77: file. Context. removeat (0 );
78. 78: // If the uploaded content is empty, complete the operation.
79. 79: If (file. Context. Count = 0)
80. 80 :{
81. 81: Bt. content = "Upload ";
82. 82: MessageBox. Show ("Upload OK ");
83. 83 :}
84. 84: else
85. 85 :{
86. 86: // If the content to be uploaded is not empty, continue uploading the remaining content.
87. 87: (sender as servicereference1.uploadserviceclient). douploadasync (file. Name, file. Context [0], true, file );
88. 88: // display progress
89. 89: Bt. content = file. Sent. tostring () + "/" + file. Size. tostring ();
90. 90 :}
91. 91 :}
92. 92 :}
93. 93 :}
94. 94:
95. 95: public class uploadfile
96. 96 :{
97. 97: // file name
98. 98: Public string name {Get; set ;}
99. 99: // File Size
100. 100: Public double size {Get; set ;}
101. 101: // you have uploaded the file.
102. 102: Public double sent {Get; set ;}
103. 103: // upload content
104. 104: public list <byte []> context {Get; set ;}
105. 105 :}

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