filestream

问题 I am attempting to use Filestream in sql server 2008 to store user uploaded images. My problem is that NHibernate will not error, but it also will not save the data into the database. No record is created. The Image class below is a custom class (not to be confused with System.Drawing.Image) public class ImageMap : ClassMap<Image> { public ImageMap() { WithTable("Images"); Id(x => x.ImageId).GeneratedBy.GuidComb().WithUnsavedValue(Guid.Empty); Map(x => x.ImageData); Map(x => x.Extension);

问题 I have created a QTextBrowser to display a large amount of data (actually displaying the run time log), which is dynamically generated in another processes. I have found out that I can use fopen("log.html","a") to append data to an actually log file, and reload() it every time it's updated, but I think that's not efficient, or even possibly unwise. I wonder if there's a neat way to implement this. 回答1: Got half way through writing this, supplemental to TonyK's answer: Perhaps the append

问题 How can we create a simple function to take the compressed content from an array of byte (compressed with Deflate method, ANSI encoded) and express it in a string? I go with this one : public string UnzipString3(byte[] byteArrayCompressedContent) { int compressedSize = byteArrayCompressedContent.Length; try { using (MemoryStream inputMemoryStream = new MemoryStream(byteArrayCompressedContent)) { //I need to consume the first 2 bytes to be able read the stream //If I consume 0 or 4, I can't

问题 I have 10 threads writing thousands of small buffers (16-30 bytes each) to a huge file in random positions. Some of the threads throw OutOfMemoryException on FileStream.Write() opreation. What is causing the OutOfMemoryException ? What to look for? I'm using the FileStream like this (for every written item - this code runs from 10 different threads): using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite, BigBufferSizeInBytes, FileOptions

问题 Is there some efficient way how to get length of data in "varbinary(max) filestream" column? I found only samples with conversion to varchar and then calling the "LEN" function. 回答1: SELECT length = DATALENGTH(Name), Name FROM Production.Product ORDER BY Name "Returns the number of bytes used to represent any expression." T-SQL and quote taken from MSDN's DATALENGTH (Transact-SQL) library. 来源： https://stackoverflow.com/questions/748165/length-of-varbinarymax-filestream-on-sql-server-2008

问题 Is there some efficient way how to get length of data in "varbinary(max) filestream" column? I found only samples with conversion to varchar and then calling the "LEN" function. 回答1: SELECT length = DATALENGTH(Name), Name FROM Production.Product ORDER BY Name "Returns the number of bytes used to represent any expression." T-SQL and quote taken from MSDN's DATALENGTH (Transact-SQL) library. 来源： https://stackoverflow.com/questions/748165/length-of-varbinarymax-filestream-on-sql-server-2008

问题 I'm using the EF 4.0 designer to create a database by clicking on "Generate Database from Model". I wan't to use the sql 2008 column type "filestream". Unfortunately I can't select "filestream" from Type DropDownList of a specific column. So, how do I use the filestream with EF 4.0 model first? So far I've googled some SQL scripts to manually add such columns, but adding them via SQL script means that I don't have them in my model. What should I do? 回答1: Entity framework doesn't support

问题 I currently playing with the XMLSerializer to understand how it works. I am able to serialize, save and de-serialize a single object without problem. However I run into problems when I try to de-serialize multiple objects. I get this error : Unhandled exception. System.InvalidOperationException: There is an error in XML document (10, 10). ---> System.Xml.XmlException: Unexpected XML declaration. The XML declaration must be the first node in the document, and no whitespace characters are

问题 I'm using Filestream for read big file (> 500 MB) and I get the OutOfMemoryException. I use Asp.net , .net 3.5, win2003, iis 6.0 I want this in my app: Read DATA from Oracle Uncompress file using FileStream and BZip2 Read file uncompressed and send it to asp.net page for download. When I read file from disk, Fails !!! and get OutOfMemory... . My Code is: using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read)) { byte[] b2 = ReadFully(fs3, 1024); } // http://www.yoda

问题 In my C# application I want to delete file in below scenario. OpenFileDialog and select any .jpg file. Display that file in PictureBox. Delete that file if needed. I already try while doing step 3 I set default Image to PictureBox just before delete but that is not work. How can I delete file? Please suggest me. // Code for select file. private void btnSelet_Click(object sender, EventArgs e) { if (DialogResult.OK == openFileDialog1.ShowDialog()) { txtFileName.Text = openFileDialog1.FileName;