C StreamReader is used to read characters to a stream in a specified encoding. Learn how to use C stream reader. C StreamReader code example. Read method reads the next character or next set of characters from the input stream.
StreamReader is inherited from TextReader that provides methods to read a character, block, line, or all content. StreamReader is defined in the System. IO namespace. Read - Reads the next character or next set of characters from the input stream. ReadAsync - Reads a specified maximum number of characters from the current stream asynchronously and writes the data to a buffer, beginning at the specified index.
ReadBlock - Reads a specified maximum number of characters from the current stream and writes the data to a buffer, beginning at the specified index. ReadBlockAsync - Reads a specified maximum number of characters from the current stream asynchronously and writes the data to a buffer, beginning at the specified index.
How to read object data from an XML file (C#)
ReadLine - Reads a line of characters from the current stream and returns the data as a string. ReadLineAsync - Reads a line of characters asynchronously from the current stream and returns the data as a string.
ReadToEnd - Reads all characters from the current position to the end of the stream. ReadToEndAsync - Reads all characters from the current position to the end of the stream asynchronously and returns them as one string.Recently announced ufc fights
The following code snippet creates a StreamReader from a filename with default encoding and buffer size. If there is an exception, the exception is displayed on the console.
WriteLine exp. The default encoding is UTF8Encoding and the buffer size to bytes. Creating a StreamReader using FileInfo. OpenText method. The following code snippet creates a StreamReader using the FileInfo.Join Stack Overflow to learn, share knowledge, and build your career.
Connect and share knowledge within a single location that is structured and easy to search. I'm trying to convert a.
For some reason in the transformer. Transform method, the reader has no root node, in fact the reader isn't reading anything from the StreamReader. My questions is what is wrong with this code? Edit: Both answers were helpful and technically aku's was closer. However I am leaning towards a solution that more closely resembles Longhorn's after trying both solutions.
I'm not sure but it seems that you didn't reset position in stream before passing it to XmlReader. Try to seek at the beginning of your stream before trying to read from it. You must select the root node. This doesn't use Datasets, but I use this function everyday and it works great. How are we doing? Please help us improve Stack Overflow. Take our short survey.
Learn more. Net 2. Asked 12 years, 5 months ago. Active 5 years, 11 months ago. Viewed 30k times. Here's a quick question I've been banging my head against today. LoadXml ds. Create sb ; transformer. Load transformXML ; transformer. LoadXml sb. ToString ; transformedXml. Save filepath ; writer. Fill ds ; ds. Create sr, null For some reason in the transformer. Improve this question.
Trevor Abell. Trevor Abell Trevor Abell 2 2 gold badges 9 9 silver badges 15 15 bronze badges. Add a comment. Active Oldest Votes. Write Encoding.Dream league soccer kits supreme
Length ; stream.Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. Here's a working version.
Also I removed the reader. ReadToEnd ; that function reads the whole stream and returns a string, so the Deserialize function couldn't use the reader anymore I also took a few liberties with the naming :. Net is picky about deserializing arrays :. How about you just save the xml to a file, and use xsd to generate C classes? And that's it! The following snippet should do the trick and you can ignore most of the serialization attributes :.
And failing that use the xsd. I don't think. The first xml document is not well formed. There is no root element, although it looks like there is. The canonical xml document has a root and at least 1 element if at all. In your example:. Kevin's anser is good, aside from the fact, that in the real world, you are often not able to alter the original XML to suit your needs. I found the answers here to be very helpful, that said I still struggled just a bit to get this working.
So, in case it helps someone I'll spell out the working solution:. XML from Original Question. The xml is in a file Class1.
I used the answer by erymski to get this working, so created a file called Car. This part may, or may not be necessary. Then choose your schema file. The idea is to have all level being handled for deserialization Please see a sample solution that solved my similar issue.
Same Way you need multiple level with car as array Check this example for multilevel deserialization. If you're getting errors using xsd. Here's a unit test to demonstrate:. That is, from. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Asked 12 years, 2 months ago.The streamed information can come from kinds of sources, such as a byte stream from a server, a file, or a TextReader class. This example uses a file named Books. You can create your own Books.
This file is also available for download; refer to the first item in the References section of this article for the download location. Create a new Visual C Console Application. You can either continue to the Complete code listing section or continue through these steps to build the application. Specify the using directive on the System. Xml namespace so that you aren't required to qualify the XmlTextReader class declarations later in your code.
You must use the using directive before any other declarations.
Streams are used to provide independence from the device; thus, program changes aren't required if the source of a stream changes. You'll use the constant in the next step with XmlTextReader. Add the following code sample to the main procedure of the default class:. This step shows a basic, outer while loop, and the next two steps describe how to use that loop and read XML.
After it is loaded, XmlTextReader performs sequential reads to move across the XML data and uses the Read method to obtain the next record. The Read method returns false if there are no more records. Inspect the nodes.
To process the XML data, each record has a node type that can be determined from the NodeType property. The Name and Value properties return the node name the element and attribute names and the node value the node text of the current node or record.
The NodeType enumeration determines the node type.Lodge pans amazon
The following sample code displays the name of the elements and the document type. Inspect the attributes. Element node types can include a list of attribute nodes that are associated with them. The MovetoNextAttribute method moves sequentially through each attribute in the element. Use the HasAttributes property to test whether the node has any attributes.
The AttributeCount property returns the number of attributes for the current node. An unhandled exception of type System.
XmlException occurred in system. The XML declaration must be the first node in the document, and no white space characters are allowed to appear before it.
Line 1, position 4. To resolve the exception error, remove the white-space character that precedes the first node in the Books. XML in. XmlReader Class. Skip to main content. Contents Exit focus mode. Copy the Books.Deserializes the XML document contained by the specified Stream.
Deserializes an XML document contained by the specified XmlReader and allows the overriding of events that occur during deserialization. Deserializes the object using the data contained by the specified XmlReader. The Stream that contains the XML document to deserialize. The Object being deserialized. The following example deserializes an object using a Stream object. Before deserializing, an XmlSerializer must be constructed using the type of the object that is being deserialized.300zx gt wing
Use the stream parameter to specify an object that derives from the Stream class, which is designed to write to streams. Classes that derive from the Stream class include:. An error occurred during deserialization. The original exception is available using the InnerException property. The following example deserializes an object using a TextReader object. If you are using a StreamReader to deserialize an object, you must construct the StreamReader with an appropriate Encoding.
The encoding specified by the XML document is ignored. Any attempt is made to access the method when the method is not overridden in a descendant class. The following example deserializes an object using an XmlReader. The XmlReader that contains the document to deserialize. An instance of the XmlDeserializationEvents class. An instance of the XmlReader class used to read the document. This method is required for deserialization of unknown headers for Web Service scenarios only.
This method allows you to avoid event synchronization in Web Service methods.My goal is to encrypt XML files. So it will not hold any similarity to an XML document. So you are just going to want to use a standard StreamReader and then handle all your decryption then depending on what you want to do with the data after you read it, you may or may not want to serialize the information.
When the program reaches this line of code:. The error you are getting is a generic error indicating the decrypted data failed. Some encryption modes encrypt in blocks of 64 byte characters.
I add the decrypt code immediately after the encrypt code to make sure I'm using the correct ssettings.
Read XML File Using XMLReader in C#
Usually I check the number of bytes created by the encryption code and compare the byte count with the number of bytes that the decrypt code gets.
The number of bytes must be the same. If they are not I start looking in the code where the bytes size gets changed. I apologize for being so ignorant about the matter, but how do you dicier the byte size? The decrypt setting should be the same as the encrypt settings.
A couple of years ago I helped somebody decrypt a message and we weren't sure which method was used to encrypt. You should specify which setting to use in the encryption and then use exactly the same key and setting when you decrypt. There is no difference between double DES and triple DES except triple you encrypt the data twice and then decrypt the data twice. I would write test application that created a key and then encrypt and decrypt the data with the same key to make sure everything worked.
Your steps to decrypt should be the reverse of your encrypt code. EncryptData elementToEncrypt, key, false. You are setting the key size and type after you are doing the encryption. I would take the encryptedElement right after this instruction and then decrypt to make sure you get exactly the same decrypted data. I am setting the key before any encryption in this code segment:.
The problem always comes from the decryption of the the XML document.Picchiare in inglese
The error I constantly get is. One of your prior posts said that sometimes null values can be added onto the byte array. Should I loop through each byte to decipher which one is null, and which is not null?
Also, how would I turn that byte array into an deencrypted XML doc? I also am encoding my xml with UTF8, but should I go a different rout with encoding? Ask a question. Quick access. Search related threads. Remove From My Forums.Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search.
I get a response from a web-server using StreamReader You have called ReadToEndhence consumed all the data into a string.
This means the reader has nothing more to give. Just: don't do that. Or, do that and use LoadXml reaponseString. The Load method is capable of fetching XML documents from remote resources. So you could simplify your code like this:. If you do it with the exact code you pasted in your question, then the problem is that you first read the whole stream into string, and then try to read the stream again when calling xmlDoc.Just cavalli t-shirt con decorazione uomo 900 black
Load responseReader. If you have already read the whole stream to the string, use that string to create the xml document xmlDoc. Load responseString. Check what's the content of responseString: probably it contains some additional headers that makes the xmlparser unhappy. The error you are getting means, that XML you receive lacks first element that wraps the whole content. Try wrapping the answer you receive with some element, for example:.
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Learn more. Asked 10 years ago. Active 7 years, 4 months ago. Viewed 63k times. GetElementsByTagName "original". Improve this question. Badr Hari Badr Hari 7, 16 16 gold badges 60 60 silver badges 96 96 bronze badges. With Console. Write responseReader ; I get prefectly formatted xml file, I have copy pasted to a file and tried to read it manually with my code also, it works.
Also - you should be using using on most of those objects. Yes, I will use it Add a comment. Active Oldest Votes. Improve this answer. Darin Dimitrov Darin Dimitrov k gold badges silver badges bronze badges. OP says he will get "Root element is missing" means there is no root element in response so should fall it in root element or should fix his response, your current code doesn't make any change to current manner.
Saeed, no, if you don't properly consume the streamreader it will return an empty string and the XmlDocument will complain. The OP first called ReadToEnd on the stream reader and then passed this same reader to the Load method but because the reader was already positioned at the end it didn't return anything.
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