小编Viv*_*ech的帖子

我在铁轨上的红宝石很新.我遇到了问题.我想创建一个文件上传功能,通过它我可以上传任何类型的文件(文本,图像等).我的控制器文件是(upload_controller.rb):

class UploadController < ApplicationController
def index
    render :file => 'app\views\upload\uploadfile.html.erb'
end
def uploadFile
    post = DataFile.save(params[:upload])
    render :text => "File has been uploaded successfully"
end
end

我的模型文件是(data_file.rb):

class DataFile < ActiveRecord::Base
    attr_accessor :upload
  def self.save(upload)
    name = upload['datafile'].original_filename
    directory = 'public/data'
    # create the file path
    path = File.join(directory,name)
    # write the file
    File.open(path, "wp") { |f| f.write(upload['datafile'].read)}
  end
end

我的View文件是(uploadfile.html.erb):

<h1>File Upload</h1>
<%= form_tag({:action => 'uploadFile'}, :multipart => true) do %>
<p><label for="upload_file">Select File</label>
<%= file_field 'upload', 'datafile' …

我取一个带有整数计数的字符串

int count=0;
string s="wow"

我正在使用 foreach 循环来计算指定字符串中的字符数

foreach(char ch in s)
{

count++
}

那么我如何计算在我的字符串中重复的那些字符，比如'w'。