C# 如何检查文件内容是否为空？
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How to check if file content is empty?
提问by HelpNeeder
I am trying to check if file doesn't have anything in it.
我正在尝试检查文件中是否没有任何内容。
This is what I have which checks/create/write to file:
这是我检查/创建/写入文件的内容：
class LastUsed
{
private static string dir = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles) + @"\Folder\";
private static string file = dir + @"\Settings.txt";
private string text;
public void CheckFileStatus()
{
if (!Directory.Exists(dir))
{
DirectoryInfo directory = Directory.CreateDirectory(dir);
}
if (!File.Exists(file))
{
using (FileStream fileStream = File.Create(file))
{
}
}
}
private void SetFileText(string writeText)
{
using (StreamWriter streamWriter = new StreamWriter(file))
{
streamWriter.Write(writeText);
}
}
private string GetFileText()
{
string readText;
using (StreamReader streamReader = File.OpenText(file))
{
readText = streamReader.ReadLine();
}
return readText;
}
public string Text
{
set
{
text = value;
SetFileText(text);
}
get
{
return GetFileText();
}
}
As we can see I can read/write file by using properties. So I have tried to check the Text property for null value but it doesn't seem to work.
正如我们所看到的，我可以使用属性来读/写文件。所以我试图检查 Text 属性的空值，但它似乎不起作用。
How should I do this?
我该怎么做？
采纳答案by Jon
Simply check if the file's size is zero bytes: Get size of file on disk.
只需检查文件的大小是否为零字节：Get size of file on disk。
回答by AaA
This code should do it
这段代码应该可以
if (new FileInfo(fileName).Length ==0){
// file is empty
} else {
// there is something in it
}
fileName is the file path that you want to look for its size
fileName 是您要查找其大小的文件路径
