[英]Parsing file but get a NullReference exception?
對不起標題,老實說,我不知道該如何描述問題。 無論如何,這是我的困境。 我目前正在解析一個信息文件。 它的“作者”和“依賴項”部分相似。 但是,信息文件的創建者可以選擇以其他方式編寫他們的信息。 可以這樣寫:
"authors" : [ "author1", "author2" ],
要么:
"authors": ["author1", "author 2"],
我需要將兩種樣式都轉換為:
author1, author2
我要解析的文件如下所示:
-snip "authors": [ "author1", "author2", "author3" -snip
我已經成功地解析了作者編寫它的第二種方式。 但是,當我嘗試解析第一種方法時,我收到了NullReference異常。 異常詳細信息如下:
用戶代碼HResult = -2147467261未處理System.NullReferenceException,消息=對象引用未設置為對象的實例。 Source = RKs工具套件StackTrace:位於C:\\ Users \\ Sam \\ Desktop \\ Programing \\ C#Projects \\ RK Mod Installer \\ RK Mod Installer \\ RK Mod Installer \\ ParseModInfo.cs:line 119中的RK_Tool_kit.ParseModInfo.getAuthors(字符串路徑)在RK_Tool_kit.AddMods.txtbxAddMods_DragDrop(Object sender,DragEventArgs e)在C:\\ Users \\ Sam \\ Desktop \\ Programing \\ C#Projects \\ RK Mod Installer \\ RK Mod Installer \\ RK Mod Installer \\ AddMods.cs:System.Windows中的第85行System.Windows.Forms.Control.System.Windows.Forms.IDropTarget.OnDragDrop(DragEventArgs drgEvent)的System.Windows.Forms.DropTarget.System.Windows.Forms.UnsafeNativeMethods.IOleDropTarget的.Forms.Control.OnDragDrop(DragEventArgs drgevent) .OleDrop(對象pDataObj,Int32 grfKeyState,POINTSTRUCT pt,Int32&pdwEffect)
InnerException:
我在這里茫然。 非常感謝。 這是我的代碼:
public static string getAuthors(string path)
{
string line;
using (StreamReader sr = new StreamReader(path))
{
while (!sr.EndOfStream)
{
line = sr.ReadLine();
if (line.Contains("author"))
{
//This detects if it is the second way the authors can write it
if (line.Contains("[") && line.Contains("]"))
{
line = line.Replace("\"authors\": ", "").Replace("\"authors\" : ", "").Replace("\"authorList\": ", "").Replace("\"authorList\" : ", "").Replace("[", "").Replace("]", "").Replace("\"", "").TrimStart(toTrim);
int Place = line.LastIndexOf(",");
string comma = ",";
line = line.Remove(Place, comma.Length).Insert(Place, "");
return line;
}
//This means the the author wrote it the first way. And the string "line" just says '"authors": [' so we want to read the line again.
else
{
line = sr.ReadLine();
line = line.Replace("\"", "").TrimStart(toTrim);
for (int i = 0; i < 101; i++)
{
//This checks to see if there is only one author in the array. If there is a comma, we want to read another line because there is another author.
if (line.Contains(","))
{
//THIS RIGHT HERE throws the exception
line = line + sr.ReadLine().Replace("\"", "").TrimStart(toTrim);
}
else
{
break;
}
}
return line;
}
}
}
}
return "N/A";
}
如果已到達流的末尾,則StreamReader.ReadLine返回null,因此您可能會得到一個空行,並嘗試在其上調用Replace("\\"", "")
。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.