Copies any nonblank elements of the specified style to the Web control, overwriting any existing style elements of the control. This method is primarily used by control developers. Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page. Sets the cached ClientID value to null. Deletes the view-state and control-state information for all the server control's child controls.
Copies the properties not encapsulated by the Style object from the specified Web server control to the Web server control that this method is called from. This method is used primarily by control developers. Called by the ASP. NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering. Creates a new ControlCollection object to hold the child controls both literal and server of the server control.
Creates the style object that is used internally by the WebControl class to implement all style related properties. Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. Determines whether the server control contains child controls. If it does not, it creates child controls.
Searches the current naming container for a server control with the specified id parameter. Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search.
You should not override this version of the FindControl method. Gets the Type of the current instance. Returns the prefixed portion of the UniqueID property of the specified control. Restores control-state information from a previous page request that was saved by the SaveControlState method.
Restores view-state information from a previous request that was saved with the SaveViewState method. Creates a shallow copy of the current Object. Copies any nonblank elements of the specified style to the Web control, but will not overwrite any existing style elements of the control.
Determines whether the event for the server control is passed up the page's UI server control hierarchy. Raises the DataBinding event. Raises the Init event. Raises the Load event. Raises the PreRender event for the FileUpload control. Raises the Unload event. Gets a Stream used to read a file. Called after a child control is removed from the Controls collection of the Control object. Sends the FileUpload control content to the specified HtmlTextWriter object, which writes the content to render on the client.
Renders the HTML opening tag of the control to the specified writer. Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client. Renders the contents of the control to the specified writer. Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled.
Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. Renders the HTML closing tag of the control into the specified writer.
Saves any server control state changes that have occurred since the time the page was posted back to the server. Saves any state that was modified after the TrackViewState method was invoked.
Assigns an event handler delegate to render the server control and its content into its parent control. Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value.
Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value. Causes the control to track changes to its view state so they can be stored in the object's ViewState property. Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.
NET page is requested. Occurs when the server control is loaded into the Page object. Occurs after the Control object is loaded but prior to rendering. For a description of this member, see ControlBuilder. For a description of this member, see GetDesignModeState.
For a description of this member, see SetOwnerControl Control. For a description of this member, see UserData. For a description of this member, see DataBindings. For a description of this member, see HasDataBindings. For a description of this member, see Expressions. For a description of this member, see HasExpressions. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. File Upload Class Reference Is this page helpful?
Please rate your experience Yes No. Any additional feedback? Namespace: System. WebControls Assembly: System. Caution These examples demonstrate the basic syntax for the FileUpload control, but they do not demonstrate all the necessary error checking that should be completed before to saving the file. In this article.
Gets or sets the access key that allows you to quickly navigate to the Web server control. Inherited from WebControl. Gets the browser-specific adapter for the control. Inherited from Control. Gets or sets a value that specifies whether multiple files can be selected for upload. Cloud Firestore. Understand Cloud Firestore. Add and manage data.
Read data. Secure and validate data. Usage, limits, and pricing. Cloud Firestore integrations. API reference. Machine Learning. Custom Models. Use a custom model. Migrate from the legacy API. Label images with your models. Detect objects with your models. Recognize text. Label images. Recognize landmarks. Deprecated Vision SDKs. Advanced Topics. Prepare for Production. The sample app checks file signatures for a few common file types.
In the following example, the file signature for a JPEG image is checked against the file:. To obtain additional file signatures, see the File Signatures Database and official file specifications. Never use a client-supplied file name for saving a file to physical storage.
Create a safe file name for the file using Path. GetRandomFileName or Path. GetTempFileName to create a full path including the file name for temporary storage. Outside of Razor, always HtmlEncode file name content from a user's request. Many implementations must include a check that the file exists; otherwise, the file is overwritten by a file of the same name. Supply additional logic to meet your app's specifications.
In the sample app, the size of the file is limited to 2 MB indicated in bytes. The limit is supplied via Configuration from the appsettings. MultipartBodyLengthLimit sets the limit for the length of each multipart body. Form sections that exceed this limit throw an InvalidDataException when parsed.
The default is ,, MB. ConfigureServices :. In a Razor Pages app, apply the filter with a convention in Startup. For apps hosted by Kestrel, the default maximum request body size is 30,, bytes, which is approximately The default request limit maxAllowedContentLength is 30,, bytes, which is approximately Customize the limit in the web. In the following example, the limit is set to 50 MB 52,, bytes :. Below are some common problems encountered when working with uploading files and their possible solutions.
The following error indicates that the uploaded file exceeds the server's configured content length:. A connection error and a reset server connection probably indicates that the uploaded file exceeds Kestrel's maximum request body size. For more information, see the Kestrel maximum request body size section. Kestrel client connection limits may also require adjustment. Also confirm that the upload naming in form data matches the app's naming.
The examples in this topic rely upon MemoryStream to hold the uploaded file's content. The size limit of a MemoryStream is int.
If the app's file upload scenario requires holding file content larger than 50 MB, use an alternative approach that doesn't rely upon a single MemoryStream for holding an uploaded file's content.
Data storage service for example, Azure Blob Storage. The following example demonstrates how to use JavaScript to stream a file to a controller action. MaxRequestBodySize in Startup. For more information, see Host ASP. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. A text box and a command button appear.
Type the path of the image file in the text box, or click Browse to locate the image file on your local computer. Click Upload to send the file to the server. If the file is unique, you receive a message that the upload succeeded.
If the file already exists on the server, you receive an appropriate message. To make this application work in the. To do this, follow these steps:. Locate the application folder in Windows Explorer.
Right-click the ApplicationName folder, and then click Properties. The ApplicationName Properties dialog box appears. HtmlInputFile Class.
0コメント