DataError.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / DataError.cs / 1 / DataError.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data { 
    using System;
    using System.Diagnostics;

    ///  
    /// Represents an custom error that can be associated with a .
    ///  
   internal sealed class DataError { 
        private string rowError = String.Empty;
 
        // column-level errors
        private int count;
        private ColumnError[] errorList;
        internal const int initialCapacity = 1; 

        internal DataError() { 
        } 

        internal DataError(string rowError) { 
            SetText(rowError);
        }

        internal string Text { 
            get {
                return rowError; 
            } 
            set {
                SetText(value); 
            }
        }

        internal bool HasErrors { 
            get {
                return(rowError.Length != 0 || count != 0); 
            } 
        }
 
        //
        // this method resets the error to the new value.
        //
        internal void SetColumnError(DataColumn column, string error) { 
            Debug.Assert(column != null, "Invalid (null) argument");
            Debug.Assert(column.Table != null, "Invalid (loose) column"); 
            if (error == null || error.Length == 0) { 
                // remove error from the collection
                Clear(column); 
            }
            else {
                if (errorList == null) {
                    errorList = new ColumnError[initialCapacity]; 
                }
                int i = IndexOf(column); 
                errorList[i].column = column; 
                errorList[i].error = error;
                column.errors++; 
                if (i == count)
                    count++;
            }
        } 

        internal string GetColumnError(DataColumn column) { 
            for (int i = 0; i < count; i++) { 
                if (errorList[i].column == column) {
                    return errorList[i].error; 
                }
            }
            return String.Empty;
        } 

        internal void Clear(DataColumn column) { 
            if (count == 0) 
                return;
 
            for (int i = 0; i < count; i++) {
                if (errorList[i].column == column) {
                    System.Array.Copy(errorList, i+1, errorList, i, count-i-1);
                    count--; 
                    column.errors--;
                    Debug.Assert(column.errors >= 0, "missing error counts"); 
                } 
            }
        } 

        internal void Clear() {
            for (int i = 0; i < count; i++) {
                errorList[i].column.errors--; 
                Debug.Assert(errorList[i].column.errors >= 0, "missing error counts");
            } 
            count = 0; 
            rowError = String.Empty;
        } 

        internal DataColumn[] GetColumnsInError() {
            DataColumn[] cols = new DataColumn[count];
 
            for (int i = 0; i < count; i++) {
                cols[i] = errorList[i].column; 
            } 
            return cols;
        } 

        /// 
        /// Sets the error message for the .
        ///  
        private void SetText(string errorText) {
            if (null == errorText) { 
                errorText = String.Empty; 
            }
            rowError = errorText; 
        }

        internal int IndexOf (DataColumn column) {
            // try to find the column 
            for (int i = 0; i < count; i++) {
                if (errorList[i].column == column) { 
                    return i; 
                }
            } 

            if (count >= errorList.Length) {
                int newCapacity = Math.Min(count*2, column.Table.Columns.Count);
                ColumnError[] biggerList = new ColumnError[newCapacity]; 
                System.Array.Copy(errorList, 0, biggerList, 0, count);
                errorList = biggerList; 
            } 
            return count;
        } 

        internal struct ColumnError {
            internal DataColumn column;
            internal string error; 
        };
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataError.cs source code in C# .NET

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