長い文字列を255文字ごとに分割する

Question

qc列を255文字ごとに複数の文字列に分割し、それらをExcelに挿入するときに再び連結する必要があります。私は考えることができるすべてについて試しましたが、私はこれがダムであることを知っていますが、私は尋ねると思っていましたが、これをどうやってやりますか？これは私の挿入コードです。ありがとう！

string lFilename = "myExcel.xls"; 
string lDistributorFolder = Server.MapPath(".") + "\\Portals\\0\\Distributors\\" + _currentUser.UserID.ToString() + "\\"; 
string lTemplateFolder = System.Configuration.ConfigurationManager.AppSettings["CPCeCommerceTemplates"]; 
System.IO.Directory.CreateDirectory(lDistributorFolder); 

File.Copy(lTemplateFolder + lFilename, lDistributorFolder + lFilename, true); 
string lConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + lDistributorFolder + "\\" + lFilename + ";Extended Properties=\"Excel 8.0;HDR=YES;\""; 
DbProviderFactory lFactory = DbProviderFactories.GetFactory("System.Data.OleDb"); 
int lSequence = 0; 
using (DbConnection lConnection = lFactory.CreateConnection()) 
{ 
    lConnection.ConnectionString = lConnectionString; 
    lConnection.Open(); 

    foreach (DataRowView rowView in dv) 
    { 
     DataRow row = rowView.Row; 

     lSequence++; 

     using (DbCommand lCommand = lConnection.CreateCommand()) 
     { 

      lCommand.CommandText = "INSERT INTO [Sheet1$]"; 
      lCommand.CommandText += "([First Name],[Last Name],[Title],[Company],[Address],[Address 2],[City],[State],[Zip],[Country],[Work phone],[Email],[Website],[Stamp Time],[Campaign],[Source],[Business Unit],[Market Segment],[Notes],[Other Source Detail],[Description],[Sales Employee firstname],[Sales Employee last name],[Reason],[Status],[Category],[Priority]) "; 
      lCommand.CommandText += "VALUES("; 
      lCommand.CommandText += "\"" + row["name"].ToString().Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["lastname"].ToString().Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["title"].ToString().Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["company"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["address"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["address2"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["city"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["state"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["zip"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["country"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["workphone"].ToString() + "\","; 
      lCommand.CommandText += "\"" + row["email"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["website"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["stamptime"].ToString() + "\","; 
      lCommand.CommandText += "\"" + row["campaign"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["source"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + string.Empty + "\","; 
      lCommand.CommandText += "\"" + row["market"].ToString() + "\","; 
      lCommand.CommandText += "\"" + row["qc"].ToString().Replace("\"", "\"\"").Replace(" ", " ") + "\","; 
      lCommand.CommandText += "\"" + row["othersourcedetail"].ToString() + "\","; 
      lCommand.CommandText += "\"" + string.Empty + "\","; 
      lCommand.CommandText += "\"" + string.Empty + "\","; 
      lCommand.CommandText += "\"" + string.Empty + "\","; 
      lCommand.CommandText += "\"" + "Lead" + "\","; 
      lCommand.CommandText += "\"" + "Open" + "\","; 
      lCommand.CommandText += "\"" + "Lead" + "\","; 
      lCommand.CommandText += "\"" + "High" + "\""; 
      lCommand.CommandText += ")"; 
      lCommand.ExecuteNonQuery(); 
     } 
    } 

    lConnection.Close(); 
} 

Answer 1

このLINQはきれいではありませんが、長さがlen（最後の部分の場合はそれ以下）の数の部分に指定した文字列strを分割します。

int len = 4; 
string str = "abcdefghijklmnopqrstuvwxyz"; 

string[] parts = 
    str.Select((chr, index) => new { chr, index }) 
     .GroupBy(entry => entry.index/len) 
     .Select(group => new string(group.Select(entry => entry.chr).ToArray())) 
     .ToArray(); 

これはもう少し読みやすいことがあります

string[] parts = 
    Enumerable.Range(0, (str.Length - 1)/len + 1) 
       .Select(i => str.Substring(i * len, Math.Min(len, str.Length - i * len))) 
       .ToArray(); 

Answer 2

String.Substring（0、255）。ループとポジションを実行します。文を分割する。それを配列に保存し、文字列の位置が文字列の終わりに達するまで255文字ごとにループを続けます。

ループ。文字列内の位置を覚えておいてください。

Answer 3

このLINQは、そのきれいではありませんが、私はまだそれのような...

int len = 255; 
for (int i = 0; i < big.Length; i += len) 
{ 
    string clip = new string(big.Skip(i).Take(len).ToArray()); 
}