如何解決「索引超出數組範圍」異常？

Question

我不斷收到這個「索引超出數組邊界」的例外。我有一個帶有文件名的數據表。 webtable頁面上有一個鏈接到桌面的列表框。我試圖從列表框中選擇多個選項。然後將每個文件名發送到處理程序.ashx文件。你會看到我正在使用for循環。

這裏是main.aspx.cs代碼：

namespace MultiImagesImageHandler 
{ 
public partial class Main : System.Web.UI.Page 
{ 

    protected void Button1_Click(object sender, EventArgs e) 
    { 
     int[] AllselectedIndex = ListBox1.GetSelectedIndices(); 
     int a = AllselectedIndex.Length; 

     DataView tempDV = SqlDataSource1.Select(DataSourceSelectArguments.Empty) as DataView; 

     for (int i = 0; i < a + 1; i++) 
     { 
      string fn = tempDV.Table.Rows[AllselectedIndex[i+1]].ItemArray[1].ToString(); 
      ImgHandler.filename[i] = fn.Trim(); 
     } 

     Response.Redirect("image1.htm"); 

    } 
} 
} 

的handler.ashx.cs代碼：

namespace MultiImagesImageHandler 
{ 
/// <summary> 
/// Summary description for ImgHandler 
/// </summary> 
public class ImgHandler : IHttpHandler 
{ 
    public static string[] filename = new string[16]; 


    public void ProcessRequest(HttpContext context) 
    { 
     string saveTo = @"fileLocation" + filename[3]; 
     FileStream writeStream1 = new FileStream(saveTo, FileMode.OpenOrCreate, FileAccess.ReadWrite); 
     string loadFrom = @"fileLocation" + filename[3]; 
     using (FileStream fs1 = File.Open(loadFrom, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) 
     { 
      ReadWriteStream(fs1, writeStream1); 
     } 
     byte[] tt = File.ReadAllBytes(context.Server.MapPath("~/images/" + filename[3])); 
     context.Response.ContentType = "image/jpeg"; 
     context.Response.BinaryWrite(tt); 

    } 

    public bool IsReusable 
    { 
     get 
     { 
      return false; 
     } 
    } 

    // readStream is the stream you need to read 
    // writeStream is the stream you want to write to 
    private void ReadWriteStream(Stream readStream, Stream writeStream) 
    { 
     int Length = 256; 
     Byte[] buffer = new Byte[Length]; 
     int bytesRead = readStream.Read(buffer, 0, Length); 
     // write the required bytes 
     while (bytesRead > 0) 
     { 
      writeStream.Write(buffer, 0, bytesRead); 
      bytesRead = readStream.Read(buffer, 0, Length); 
     } 
     readStream.Close(); 
     writeStream.Close(); 
    } 
} 
} 

我認爲這將填補陣列，使ImgHandler.ashx.cs從數據表中選擇的文件名，但它沒有。它不斷提出這個例外。我不知道爲什麼這不起作用。

Answer 1

我覺得這是你的問題：

for (int i = 0; i < a + 1; i++) 
{ 
    string fn = tempDV.Table.Rows[AllselectedIndex[i+1]].ItemArray[1].ToString(); 
    ImgHandler.filename[i] = fn.Trim(); 
} 

改變 「A + 1」 只是 「一個」

Answer 2

您有：

for (int i = 0; i < a + 1; i++) 

應該是：

for (int i = 0; i < a; i++) 

Answer 3

string sRecontent = txtrepalcecontent.Text; 
    string[] fileLineString = new string[sContent.Length]; 
    for (int i =0 ; i < sContent.Length; i++) 

    { 
     //fileLineString[0] = sContent[0].ToString(); 
     string[] content = sContent.Split(delim); 
     if (sFind == content[i]) **//index was outside the bounds the array** 
     { 
      string A = sContent.Remove(i, txtfind.Text.Length); 
      string S = A.Insert(i, sReplace); 
      txtrepalcecontent.Text = S; 
     }