cefsharp/CefSharp · error · ArgumentNullException

fieldInfo

Error message

fieldInfo

What it means

Thrown by the BindingMemberInfo(FieldInfo) constructor when fieldInfo is null. Like the PropertyInfo overload, the constructor reads FieldType/Name from the argument, so the guard fails fast with ArgumentNullException naming 'fieldInfo' instead of letting a null slip through to a later NullReferenceException.

Source

Thrown at CefSharp/ModelBinding/BindingMemberInfo.cs:54

            {
                throw new ArgumentNullException("propertyInfo");
            }

            memberInfo = propertyInfo;

            Type = propertyInfo.PropertyType;
            Name = propertyInfo.Name;
        }

        /// <summary>
        /// Constructs a BindingMemberInfo instance for a field.
        /// </summary>
        /// <param name="fieldInfo">The bindable field to represent.</param>
        public BindingMemberInfo(FieldInfo fieldInfo)
        {
            if (fieldInfo == null)
            {
                throw new ArgumentNullException("fieldInfo");
            }

            memberInfo = fieldInfo;

            Type = fieldInfo.FieldType;
            Name = fieldInfo.Name;
        }

        /// <summary>
        /// Sets the value from a specified object associated with the property or field represented by this BindingMemberInfo.
        /// </summary>
        /// <param name="destinationObject">The object whose property or field should be assigned.</param>
        /// <param name="newValue">The value to assign in the specified object to this BindingMemberInfo's property or field.</param>
        public void SetValue(object destinationObject, object newValue)
        {
            if (memberInfo is PropertyInfo)
            {
                ((PropertyInfo)memberInfo).SetValue(destinationObject, newValue, null);

View on GitHub (pinned to 16bc6e0711)

Solutions

1. Null-check the FieldInfo (from Type.GetField) before constructing BindingMemberInfo.
2. Confirm the field name/casing used in reflection.
3. Use nameof() to keep reflection lookups bound to real members.
4. Throw a clear error at the reflection site when the field is absent.

Example fix

// before
var fi = type.GetField("Flag"); // field renamed -> null
var bm = new BindingMemberInfo(fi);

// after
var fi = type.GetField(nameof(MyVm.Flag));
if (fi == null) throw new InvalidOperationException("Field not found on " + type);
var bm = new BindingMemberInfo(fi);

var fi = type.GetField(nameof(MyVm.Flag));
if (fi == null) throw new InvalidOperationException("Field not found on " + type.FullName);
var bm = new BindingMemberInfo(fi);

static bool TryCreate(FieldInfo fi, out BindingMemberInfo bm) {
    bm = fi == null ? default : new BindingMemberInfo(fi); return fi != null; }

try { var bm = new BindingMemberInfo(fi); }
catch (ArgumentNullException ex) when (ex.ParamName == "fieldInfo")
{ /* reflection miss; log and skip member */ }

When it happens

Trigger: Passing a FieldInfo from Type.GetField that returned null (misspelled or non-existent field name), or a nullable expression without a prior null check.

Common situations: Reflecting over a field name that does not exist; class refactor removing the field; binding filter passing a null upstream.

Related errors

• propertyInfo
• browser
• Please provide a valid array
• converter
• manager

AI-assisted analysis of cefsharp/CefSharp@16bc6e0711 (2026-08-13). Data as JSON: /api/errors/c1f5b3aaf588ff70. Report an issue: GitHub.