Converting string to int for comparison-CodePudding

I have identity set up on my Razor pages ASP.NET Core web application, and I've set the user name to V003950. A bit of backstory on my web app is that you can upload/download files, an admin can upload and assign a user, then the user logs on and can only see their files.

The id I am trying to compare it to is an integer, and the Id is 3950, so I'm trying to do an if statement like this:

@foreach (var item in Model.Files)
    {
        if(User.Identity?.Name! == item.VendorId){
            if (item.FileType == "Purchase Order")
            {
                <tr>
                    <td>
                        @Html.DisplayFor(modelItem => item.Number)
                    </td>
                    @*<td>
                        @Html.DisplayFor(modelItem => item.Date)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.Value)
                    </td>*@
                    @*<td>
                        @Html.DisplayFor(modelItem => item.FileType)
                    </td>
                    <td>
                        <a asp-page="Upload" asp-route-id="@item.Id">Upload File</a>
                    </td>*@
                    <td>
                        @if (item.Attachment != null)
                        {
                            <form asp-page-handler="Download" method="post" asp-route-id="@item.Id">
                                <input type="submit"  value="Download">
                            </form>
                        }
                    </td>
                </tr>
            }
        }
    }

but because one is a string and one is an int it doesnt work. I've also tried converting the name to int, but the V at the start is becoming a problem.

Is there a way for me to remove the leading V from the if or maybe add in a .contains instead?

CodePudding user response：

Combining the ideas mentioned in the comments, I suggest to remove the first character from Name using String.Substring, then convert it to int using int.TryParse and finally compare it to the VendorId, like this:

if (int.TryParse(User.Identity?.Name?.Substring(1), out int nameAsInteger) &&
    nameAsInteger == item.VendorId)
{
}

CodePudding user response：

If your UserName are all in the style of V some number, So you can use this code:

@foreach (var item in Model.Files)
    {
       var result = User.Identity?.Name;
       if(result!=null){
           if(Int32.Parse(result.Substring(1, result.Length - 1)) == item.VendorId){
              //.......
              }
       }
   }

CodePudding user response：

Try converting your integer to string with .ToString()

Like rbdeenk mentioned in his comment you can get rid of the "V" in your name using

.Trim( new Char[] { 'v', 'V' } )

and then compare the two strings.