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Accepted
Eduardo Ortiz
Asked: 2020-04-18 11:31:39 +0800 CST 2020-04-18 11:31:39 +0800 CST

Cannot implicitly convert type System.Collections.Generic.IEnumerable

  • 772

I have a class called AlumnoViewModel and a controller called AlumnoesController but when I leave the fields that I want to list in the controller it gives me an error telling me that I cannot convert implicitly,

this is my controller

    // GET: api/Alumnoes/listar
    [HttpGet("[action]")]
    public async Task<ActionResult<IEnumerable<Alumno>>> Listar()
    {
        var alumno = await _context.Alumnos.ToListAsync();

        return alumno.Select(c => new AlumnoViewModel
        {
            id_alumno = c.id_alumno,
            nombre = c.nombre,
            apellido = c.apellido,
            calle_numero = c.calle_numero,
            colonia = c.colonia,
            ciudad_estado = c.ciudad_estado,
            lada = c.lada,
            Telefono = c.Telefono,
            pais = c.pais,
            codigo_postal = c.codigo_postal,
            correo_institucional = c.correo_institucional,
            sexo = c.sexo,
            nacionalidad = c.nacionalidad,
            estado = c.estado
        });

    }
c#

1 Answers

  1. Best Answer

    In the Action it is defined that you are going to return aIEnumerable<Alumno>

    [HttpGet("[action]")]
    public async Task<ActionResult<IEnumerable<Alumno>>> Listar()
    ...

    However, when returning the values ​​you are returned through the select aIEnumerable<AlumnoViewModel>

    return alumno.Select(c => new AlumnoViewModel ...

    To fix it your code should look like this

    // GET: api/Alumnoes/listar
    [HttpGet("[action]")]
    public async Task<ActionResult<IEnumerable<AlumnoViewModel>>> Listar()
    {
        var alumno = await _context.Alumnos.ToListAsync();

        return alumno.Select(c => new AlumnoViewModel
        {
            id_alumno = c.id_alumno,
            nombre = c.nombre,
            apellido = c.apellido,
            calle_numero = c.calle_numero,
            colonia = c.colonia,
            ciudad_estado = c.ciudad_estado,
            lada = c.lada,
            Telefono = c.Telefono,
            pais = c.pais,
            codigo_postal = c.codigo_postal,
            correo_institucional = c.correo_institucional,
            sexo = c.sexo,
            nacionalidad = c.nacionalidad,
            estado = c.estado
        });

    }
    • 2