cefsharp/CefSharp · error · ArgumentNullException

propertyInfo

Error message

propertyInfo

What it means

Thrown by the BindingMemberInfo(PropertyInfo) constructor when propertyInfo is null. The constructor stores the member info and reads PropertyType/Name from it, so a null reference would otherwise cause a NullReferenceException later; the guard fails fast with ArgumentNullException naming 'propertyInfo'.

Source

Thrown at CefSharp/ModelBinding/BindingMemberInfo.cs:37

        /// <summary>
        /// Gets the name of the property or field represented by this BindingMemberInfo.
        /// </summary>
        public string Name { get; private set; }

        /// <summary>
        /// Gets the data type of the property or field represented by this BindingMemberInfo.
        /// </summary>
        public Type Type { get; private set; }

        /// <summary>
        /// Constructs a BindingMemberInfo instance for a property.
        /// </summary>
        /// <param name="propertyInfo">The bindable property to represent.</param>
        public BindingMemberInfo(PropertyInfo propertyInfo)
        {
            if (propertyInfo == null)
            {
                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");
            }

View on GitHub (pinned to 16bc6e0711)

Solutions

1. Null-check the PropertyInfo (from Type.GetProperty) before constructing BindingMemberInfo.
2. Verify the property name/casing used in reflection calls.
3. Use nameof() to keep reflection strings in sync with members.
4. Fail with a descriptive error at the reflection site if the property is not found.

Example fix

// before
var pi = type.GetProperty("Titel"); // misspelling -> null
var bm = new BindingMemberInfo(pi);

// after
var pi = type.GetProperty(nameof(MyVm.Title));
if (pi == null) throw new InvalidOperationException("Property not found on " + type);
var bm = new BindingMemberInfo(pi);

var pi = type.GetProperty(nameof(MyVm.Title));
if (pi == null) throw new InvalidOperationException("Property not found on " + type.FullName);
var bm = new BindingMemberInfo(pi);

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

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

When it happens

Trigger: Passing a PropertyInfo obtained via reflection that resolved to null (e.g. Type.GetProperty returned null for a misspelled/missing property), or passing a nullable expression without a null check.

Common situations: Reflecting over a member name that does not exist; refactoring a class so the reflected property disappears; binding infrastructure receiving a null from an upstream filter.

Related errors

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

AI-assisted analysis of cefsharp/CefSharp@16bc6e0711 (2026-08-13). Data as JSON: /api/errors/c5fe5249ae700c68. Report an issue: GitHub.