PictureBox.Load Method

Source:

PictureBox.cs

Source:

PictureBox.cs

Source:

PictureBox.cs

public:
 void Load();

public void Load();

member this.Load : unit -> unit

Public Sub Load ()

Exceptions

Remarks

Starting with .NET 8, the behavior of how a PictureBox control loads a remote image changed. By default, the System.Net.ServicePointManager.CheckCertificateRevocationList property is set to true before a remote image is downloaded through WebClient. This setting ensures that servers with certificates have those certificates checked against the certificate authority revocation list (CRL) as part of the validation process.

A previously working remote resource might fail to load when the locally cached CRL is out-of-date and an update can't be retrieved. This can happen when the network the app is running on is restricted and the CRL location isn't on the allowlist.

It's also possible that the delay in checking the CRL negatively affects the app's ability to function.

You can opt out of this behavior by setting the System.Windows.Forms.ServicePointManagerCheckCrl option for the app, in one of the following ways:

• Set the property to false in the [app].runtimeconfig.json configuration file:

  JSON Copy

  {
    "configProperties": {
      "System.Windows.Forms.ServicePointManagerCheckCrl": false
    }
  }
  

• Add a <RuntimeHostConfigurationOption> item in the project file to disable it:

  XML Copy

  <ItemGroup>
    <RuntimeHostConfigurationOption Include="System.Windows.Forms.ServicePointManagerCheckCrl" Value="false" />
  </ItemGroup>
  

See also

• LoadAsync

Source:

PictureBox.cs

Source:

PictureBox.cs

Source:

PictureBox.cs

public:
 void Load(System::String ^ url);

public void Load(string url);

member this.Load : string -> unit

Public Sub Load (url As String)

Parameters

Exceptions

Remarks

If the url parameter indicates a local file, the recommended format is a local file path. For example, an image file named myPicture.jpg located at c:\ would be accessed by passing c:\myPicture.jpg for the url parameter. A full path, such as http://www.contoso.com/path/images/image.jpg, or a relative path, such as ./images/image.jpg, can be used. If a relative path is used, it will be considered relative to the working directory. A call to the Load method sets the ImageLocation property to the value of the url parameter.

Load behavior changes

Starting with .NET 8, the behavior of how a PictureBox control loads a remote image changed. By default, the System.Net.ServicePointManager.CheckCertificateRevocationList property is set to true before a remote image is downloaded through WebClient. This setting ensures that servers with certificates have those certificates checked against the certificate authority revocation list (CRL) as part of the validation process.

A previously working remote resource might fail to load when the locally cached CRL is out-of-date and an update can't be retrieved. This can happen when the network the app is running on is restricted and the CRL location isn't on the allowlist.

It's also possible that the delay in checking the CRL negatively affects the app's ability to function.

You can opt out of this behavior by setting the System.Windows.Forms.ServicePointManagerCheckCrl option for the app, in one of the following ways:

• Set the property to false in the [app].runtimeconfig.json configuration file:

  JSON Copy

  {
    "configProperties": {
      "System.Windows.Forms.ServicePointManagerCheckCrl": false
    }
  }
  

• Add a <RuntimeHostConfigurationOption> item in the project file to disable it:

  XML Copy

  <ItemGroup>
    <RuntimeHostConfigurationOption Include="System.Windows.Forms.ServicePointManagerCheckCrl" Value="false" />
  </ItemGroup>
  

See also

• ImageLocation