Xml handling with ASPNET MVC Core?

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Xml handling with ASPNET MVC Core?

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#1 by (2 votes)

1

I'm working with Xml upload using ASPNET MVC Core , I get in controller the file this way:

public async Task<IActionResult> Upload(IFormFile param)
{
}

But I need to check it out before finishing the code and uploading it. My problem is to read the file through XDocument , because it does not accept this type of element that is coming.

This way:

var dataXml = XDocument.Load(param)
                      .Descendants("ide")
                      .First()
                      .Element("dhEmi")
                      .Value;

File submission form:

<form role="form" asp-action="Upload" enctype="multipart/form-data">
   <input type="file" name="id" id="id"  multiple />
   <input type="submit" value="Upload" />
</form>

I've tried converting to string and other media but no success and does anyone have any ideas?

c# asp.net-mvc xml xdocument

asked by anonymous 20.07.2017 / 22:41

1 answer

Automate reading of multiple text files in a Python script error while zeroing a string

score 2 · Answer 1

In the new ASP.NET Core development model , you use Interface IFormFile which is responsible for working with% type% input .

The problem that is happening is that the value should be a list and not 1 element, because your form setting in file is with input , example : multiple .

Basic example:

Html

<form role="form" asp-action="Upload" enctype="multipart/form-data">
    <input type="file" name="id" id="id"  multiple />
    <input type="submit" value="Upload" />
</form>

Controller

public async Task<IActionResult> Upload(List<IFormFile> id)

Being a very important factor, the name of List<IFormFile> is the same name that is placed in the folder that will receive the files, for example, you put input in the name of id it must follow the same name for the input .

How will you get the values being what your setting was in a list?

I've set a minimal example to illustrate this, where controller can send multiple files to input :

Xml

<?xml version="1.0" encoding="utf-8" ?>
<root>
  <cliente>
    <id>1</id>
    <nome>stackoverflow</nome>
  </cliente>
</root>

Html

<form role="form" asp-action="Upload" enctype="multipart/form-data">
    <input type="file" name="id" id="id" multiple />
    <input type="submit" value="Upload" />
</form>

Controller

[AcceptVerbs("POST", "GET")]
public async Task<IActionResult> Upload(List<IFormFile> id)
{    
    if (Request.Method.Equals("POST"))
    {
        foreach (var formFile in id)
        {
            if (formFile.Length > 0)
            {
                using (MemoryStream str = new MemoryStream())
                {
                    formFile.CopyTo(str);
                    str.Position = 0;
                    var xml = (from x in XDocument.Load(str).
                        Descendants("cliente")
                              let _id = x.Element("id").Value
                              let _nm = x.Element("nome").Value
                              select new
                              {
                                  Id = _id,
                                  Nome = _nm
                              })
                              .FirstOrDefault();
                }
            }
        }
    }  
    return View();
}

In the example example I only sent one, but with the same layout as controller you can send several, if you prefer.

Remember that if it's just 1 file at a time, just take the part of the collection as follows:

Xml

<?xml version="1.0" encoding="utf-8" ?>
<root>
  <cliente>
    <id>1</id>
    <nome>stackoverflow</nome>
  </cliente>
</root>

Html

<form role="form" asp-action="Upload" enctype="multipart/form-data">
    <input type="file" name="id" id="id" />
    <input type="submit" value="Upload" />
</form>

Controller

[AcceptVerbs("POST", "GET")]
public async Task<IActionResult> Upload(IFormFile id)
{    
    if (Request.Method.Equals("POST"))
    {                
        if (id.Length > 0)
        {
            using (MemoryStream str = new MemoryStream())
            {
                await id.CopyToAsync(str);
                str.Position = 0;
                var xml = (from x in XDocument.Load(str).
                    Descendants("cliente")
                            let _id = x.Element("id").Value
                            let _nm = x.Element("nome").Value
                            select new
                            {
                                Id = _id,
                                Nome = _nm
                            })
                            .FirstOrDefault();
            }
        }               
    }  
    return View();
}

that is, in Xml take the setting input and in multiple leave only the interface IFormFile

References