ArgumentException on PropertyInfo.SetValue() in .Net Compact

.net c# compact-framework dapper dapper-lite


I am using DapperLite, a port of Dapper, for use in Compact Framework. I get an ArgumentException, no other info in the below method at the specified line of the SqlMapper.cs file.

Really struggling with what to look for next or what's actually broken.

/// <summary>
    /// Populate a references type from an IDataRecord by matching column names to property names.
    /// </summary>
    private static void PopulateClass(object objectClass, IDataRecord reader)
        Type theType = objectClass.GetType();
        PropertyInfo[] p = theType.GetProperties();

        // Only set properties which match column names in the result.
        foreach (string columnName in GetColumnNames(reader))
            string colName = columnName;
            object value = reader[colName];
            PropertyInfo pi = p.FirstOrDefault(x => x.Name == colName);

            if (pi == null || value == DBNull.Value) continue;

            Type columnType = value.GetType();
            Type actualType = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;

            // Check for a directly assignable type
            if (actualType == columnType || actualType == typeof(string) || actualType == typeof(int))
                // Error generated here
                pi.SetValue(objectClass, value, null);
                value = actualType.GetMethod("Parse", new[] { typeof(string) }).Invoke(null, new[] { value });
                pi.SetValue(objectClass, value, null);

The values at that point are objectClass = Models.Employee and value=1. The colName, from further up in the Method, is Id which is an int in the Employee model.

Added Employee Model based on Comment:

namespace BioPadPunchClock.Models
    public class Employee
        public int Id { get; set; }
        public int CDB_Employee_PK { get; set; }  //Employee PK in the Central DB. If .null., new emp record on this timeclock needs to be pushed to the CDB.
        public string Name { get; set; }
        //public string FaceImage { get; set; }  //path to Jpeg image 136x90 pixels .\NAND\pictures\  named as <pk>.jpg
        public DateTime? BirthDate { get; set; }
        public string Status { get; set; }  //Full Time – Hourly, Inactive, Terminated, Part Time - Hourly  
        public DateTime? LastPunch { get; set; }
        public string LastPunchDirection { get; set; }  //IN or OUT
        public string PIN { get; set; }  // 4 digit
        public int CardNum { get; set; }  //HID Card Number
        public int CardFacCode { get; set; }  //HID Card Facility Code
        public string FpTemplate { get; set; }  //Fingerprint Template (registered fingerprint)
        public DateTime? LastUpdate { get; set; }  //When this employee record was last sync’d to the CDB. This value will match exactly in the LDB and CDB after a successful sync.
        public int DayTotal { get; set; } // Minutes cumulative for the current day at time of last punch
        public int PayPeriodTotal { get; set; } //Minutes cumulative for the current pay period at time of last punch
        public string Department { get; set; }
        public string SSN { get; set; }
        public bool ShouldPromptDept { get; set; } //Prompt employee to choose department each time

Further findings...

When I look at my Model.Employee at that point all of the string properties say Could not evaluate expression with a red exclamation point. Is this a clue or normal?

Further findings...

Not sure if this matters or not but when I step through the code and inspect the values I notice that the actualType == Int32 and the columnType==Int64 while the value it's evaluating is 1.

Not sure that makes any difference since there is a actualType.Equals(typeof(int)) but figured I'd mention it.

Accepted Answer

We figured this out on GitHub with the last piece of information.

Since the columnType is Int64 for the Id column, changing the type of the Id column in the model to Int64 will fix this issue.

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Licensed under: CC-BY-SA with attribution
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Is this KB legal? Yes, learn why