Ошибка int32 как исправить

static void Main(string[] args)
{

    string s = "Сегодня мы с вами рассмотрели, как работать со строками в Си-шарп. Были описаны основные операторы и методы, которые используются для работы со строками";

    string res = s.Substring(s.IndexOf("Были"), Convert.ToInt32( s.IndexOf(", которые") - s.IndexOf("Были")));
    Console.WriteLine(res);
    Console.ReadKey();
}

6

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• User-1640542475 posted

  Hi

  I have an error ‘System.Int32’ type to the ‘System.String’ type is not valid in mvc api .

  Pls advice me

  Thank you
  Maideen

  It is my code

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  
  namespace advEditorials.Models
  {
      public class MoDetails
      {
          public int Id { get; set; }
          public string DocNo { get; set; }
          public DateTime PubDate { get; set; }
          public string MainSection { get; set; }
          public string SubSection { get; set; }
          public string Position { get; set; }
          public string Color { get; set; }
          public decimal SizeH { get; set; }
          public decimal SizeW { get; set; }
          public decimal Volume { get; set; }
          public decimal PageNumber { get; set; }
          public string Materials { get; set; }
          public string Remarks { get; set; }
          public string Status { get; set; }
  
      }
  }
  

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;
  using System.Web;
  
  namespace advEditorials.Models
  {
      public interface IMORepository
      {
          Task Add(MoDetails mo);
          Task Update(MoDetails mo);
          Task Delete(string id);
          Task<MoDetails> Getmo(string id);
          Task<IEnumerable<MoDetails>> GetmoALL();
      }
  }

  using System;
  using System.Collections.Generic;
  using System.Data.Entity;
  using System.Linq;
  using System.Threading.Tasks;
  using System.Web;
  
  namespace advEditorials.Models
  {
      public class MORepository :IMORepository
      {
          private readonly SqlDbContext db = new SqlDbContext();
  
  // Retrive All
          public async Task<IEnumerable<MoDetails>> GetmoALL()
          {
              try
              {
                  var mo = await db.tbl_Editorial.ToListAsync();
                  return mo.AsQueryable();
              }
              catch
              {
                  throw;
              }
          }
  
   // by ID
          public async Task<MoDetails> Getmo(string id)
          {
              try
              {
                  MoDetails mo = await db.tbl_Editorial.FindAsync(id);
                  if (mo == null)
                  {
                      return null;
                  }
                  return mo;
              }
              catch
              {
                  throw;
              }
          }
   //Add
          public async Task Add(MoDetails mo)
          {
              mo.Id = Guid.NewGuid().ToString();
              
              db.tbl_Editorial.Add(mo);
              try
              {
                  await db.SaveChangesAsync();
              }
              catch
              {
                  throw;
              }
          }
  
          //Update
          public async Task Update(MoDetails mo)
          {
              try
              {
                  db.Entry(mo).State = EntityState.Modified;
                  await db.SaveChangesAsync();
              }
              catch
              {
                  throw;
              }
          }
  //Delete
          public async Task Delete(string id)
          {
              try
              {
                  MoDetails mo = await db.tbl_Editorial.FindAsync(id);
                  db.tbl_Editorial.Remove(mo);
                  await db.SaveChangesAsync();
              }
              catch
              {
                  throw;
              }
          }
  
          private bool MOExists(string id)
          {
              return db.tbl_Editorial.Count(e => e.Id == id) > 0;
          }
      }
  } 
  

  Controller
  
  using advEditorials.Models;
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Net;
  using System.Net.Http;
  using System.Threading.Tasks;
  using System.Web.Http;
  
  namespace advEditorials.Controllers
  {
      public class EditorialController : ApiController
      {
          private readonly IMORepository _iMORepository = new MORepository();
  
          [HttpGet]
          //[Route("api/Editorial/Get")]
          public async Task<IEnumerable<MoDetails>> Get()
          {
              return await _iMORepository.GetmoALL();
          }
  
          [HttpPost]
          [Route("api/Editorial/Create")]
          public async Task CreateAsync([FromBody]MoDetails mo)
          {
              if (ModelState.IsValid)
              {
                  await _iMORepository.Add(mo);
              }
          }
  
          [HttpGet]
          [Route("api/Editorial/Details/{id}")]
          public async Task<MoDetails> Details(string id)
          {
              var result = await _iMORepository.Getmo(id);
              return result;
          }
  
          [HttpPut]
          [Route("api/Editorial/Edit")]
          public async Task EditAsync([FromBody]MoDetails mo)
          {
              if (ModelState.IsValid)
              {
                  await _iMORepository.Update(mo);
              }
          }
  
          [HttpDelete]
          [Route("api/Editorial/Delete/{id}")]
          public async Task DeleteConfirmedAsync(string id)
          {
              await _iMORepository.Delete(id);
          }
      }
  }

  db Table
  
  CREATE TABLE [dbo].[tbl_Editorial](
  	[id] [nvarchar](20) NOT NULL,
  	[DocNo] [varchar](20) NULL,
  	[pubdate] [date] NULL,
  	[MainSection] [varchar](50) NULL,
  	[SubSection] [varchar](50) NULL,
  	[Position] [varchar](50) NULL,
  	[Color] [varchar](20) NULL,
  	[SizeH] [float] NULL,
  	[SizeW] [float] NULL,
  	[Volume] [float] NULL,
  	[PageNumber] [float] NULL,
  	[Materials] [varchar](100) NULL,
  	[Remarks] [varchar](100) NULL,
  	[Status] [varchar](20) NULL,
  	[Category] [varchar](50) NULL
  ) ON [PRIMARY]
  GO
  
  
  

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• Hi.

  Please someone help with this error:

  cannot perform ‘>=’ operation on system.int32 and system.string

  This is the error which always give me when executing this one when comparing prices between two values like, i > 5 && i < 10:

  dataGrid6.DefaultView.RowFilter = «Price >= » + textBox6.Text + «‘ And Price <= » + textBox7.Text + «‘»;

  The interesting thing is when i load excel file in datagridview and try executing this one works, but when i scrape data from website and than executing this one in the other gridview for new scraped data this error shows. please help. 

  just this query not work i’ve tried to executre other with LIKE works well.

  tnx

  • Edited by

    Sunday, May 18, 2014 4:12 AM
    Found solution for my prev question, but now i have new one