Question

我想获取用户并过滤给定的用户名是否存在。我的财产有问题

“对象”类型上不存在“过滤器”

    TakeUsernameIfExist(user: User) {
    return this.http.get(this.rootUrl + 'api/TakeUserName/' + user.UserName )
      .delay(1000)
      .map(users => users.filter( data => data === user.UserName))
      .map(users => !users.length);
}

我为过滤器添加了导入，问题仍然存在。

导入'rxjs / add / operator / filter'; 我的Web API方法：

    [HttpGet]
    [AllowAnonymous]
    [Route("api/TakeUserName/{username}")]
    public  string TakeUserName(string username)
    {
        var userStore = new UserStore<ApplicationUser>(new ApplicationDbContext());
        var manager = new UserManager<ApplicationUser>(userStore);

        var result =  userStore.FindByNameAsync(username);
        if(result==null)
        {
            return null;
        }
        else
        {
            return result.Result.UserName;
        }

    }

欢迎任何帮助或建议。

Answer 1

您的问题是您没有从WEBAPI返回列表（或Array），但返回了对象。.并且Filter JS方法在ARRAY上有效

因此，这里不需要过滤方法，因为您正在搜索用户名（并且在Identity Asp.NET中不能有多个用户使用2个相似的用户名）

因此请在您的WEB API中尝试此操作，以返回布尔值：

<?php

// Input specified as string for the sake of this demo.
$inputData = <<<EOT
        XYZ    -       -       -
        Day1    12      28      MCS
        Day2    15      30      PCS
        Day3    18      28      LH
        Day4    11      26      SUN
        Day5    20      34      RA
        Day6    16      26      PCS
        Day7    6       15      FO
EOT;
// Split string on EOL character, into array.
$input = explode(PHP_EOL, $inputData);

// Or, if you're reading from a file, comment everything above and uncomment the following line:
// $input = file('Data/data/XYZ.txt');

// $input is now an array, and allows us to iterate over it using foreach.
// $rowIndex will hold the array index, $line will hold a single line from the input.
foreach ($input as $rowIndex => $line)
{
    // Skip header.
    if ($rowIndex == 0)
        continue;

    // Trim any unwanted leading whitespace, so the resulting array starts with a usable value.
    // preg_split() will split the line on whitespace, and return an array of all column values.
    $cols = preg_split('/[\s]+/', trim($line));

    // You can now read out the array of column values however you see fit.
    $v1 = $cols[0];
    $v2 = $cols[1];
    $v3 = $cols[2];
    $v4 = $cols[3];

    echo "v1=$v1 v2=$v2 v3=$v3 v4=$v4<br>\n";
}

所以在您的客户中：

   [HttpGet]
    [AllowAnonymous]
    [Route("api/TakeUserName/{username}")]
    public async<IHttpActionResult> TakeUserName(string username) //<-- IHttpActionResult  is better
    {
        var userStore = new UserStore<ApplicationUser>(new ApplicationDbContext());
        var manager = new UserManager<ApplicationUser>(userStore);

        var result =await userStore.FindByNameAsync(username);


            return  (result==null || !result.IsSuccess //<-- not sure for this prorperty name) ? Ok(false) : Ok( !string.isNullOrEmtpy(result.UserName);


    }

希望对您有帮助！

属性“过滤器”不存在

1 个答案: