[英]NullReference Exception in converting string to Char array
它Null Reference Exception on line char[] myChar = read.ToCharArray();
显示Null Reference Exception on line char[] myChar = read.ToCharArray();
。
我不知道。 请帮忙
class Program
{
static void Main(string[] args)
{
StreamReader myReader = new StreamReader("TextFile1.txt");
string read = "";
while (read != null)
{
read = myReader.ReadLine();
Console.WriteLine(read);
}
char[] myChar = read.ToCharArray();
for (int i = 0; i < myChar.Length; i++)
{
Console.WriteLine(myChar[i]);
}
Console.WriteLine(read);
myReader.Close();
Console.ReadKey();
}
}
循环结束后, read
应为null
,并且在null上调用ToCharArray
应该会产生异常。 您可以将此语句放入while循环中。 我相信您正在尝试做一些实验,因为已经使用Console.WriteLine(read);
打印了字符串Console.WriteLine(read);
while ((read = sr.ReadLine()) != null)
{
Console.WriteLine(read);
char[] myChar = read.ToCharArray();
for (int i = 0; i < myChar.Length; i++)
Console.WriteLine(myChar[i]);
}
StringBuilder sb = new StringBuilder();
using (StreamReader sr = new StreamReader("TestFile.txt"))
{
string line;
// Read and display lines from the file until the end of
// the file is reached.
while ((line = sr.ReadLine()) != null)
{
Console.WriteLine(line);
sb.Append(line);
}
}
var chars = sb.ToString().ToCharArray();
但是,您应该将每一行添加到stringbuilder中,然后将其转换为char数组。 事情就是您真正想做的吗?
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